diff --git a/app/components/ComponentItem.vue b/app/components/ComponentItem.vue
index 3a6c2bc..1aeca6a 100644
--- a/app/components/ComponentItem.vue
+++ b/app/components/ComponentItem.vue
@@ -320,13 +320,13 @@
       </div>
 
       <!-- Sub Components -->
-      <div v-if="component.subComponents && component.subComponents.length > 0" class="space-y-3">
+      <div v-if="childComponents.length > 0" class="space-y-3">
         <h4 class="font-semibold text-gray-700">
           Sous-composants
         </h4>
         <div class="space-y-3 pl-4 border-l-2 border-gray-200">
           <ComponentItem
-            v-for="subComponent in component.subComponents"
+            v-for="subComponent in childComponents"
             :key="subComponent.id"
             :component="subComponent"
             :is-edit-mode="isEditMode"
@@ -415,6 +415,10 @@ const componentModelOptionsList = computed(() => {
   return Array.isArray(provided) && provided.length ? provided : props.componentModelOptions
 })
 const pieceModelOptionsList = computed(() => props.pieceModelOptionsProvider(props.component) || [])
+const childComponents = computed(() => {
+  const list = props.component.subcomponents || props.component.subComponents || []
+  return Array.isArray(list) ? list : []
+})
 function fieldKeyFromNameAndType(name, type) {
   const normalizedName = typeof name === 'string' ? name : ''
   const normalizedType = typeof type === 'string' ? type : ''
diff --git a/app/components/ComponentModelStructureEditor.vue b/app/components/ComponentModelStructureEditor.vue
index 3328261..a3a596b 100644
--- a/app/components/ComponentModelStructureEditor.vue
+++ b/app/components/ComponentModelStructureEditor.vue
@@ -22,6 +22,7 @@ import {
 } from '~/shared/modelUtils'
 import { usePieceTypes } from '~/composables/usePieceTypes'
 import { useComponentTypes } from '~/composables/useComponentTypes'
+import type { ComponentModelStructure } from '~/shared/types/inventory'
 
 defineOptions({ name: 'ComponentModelStructureEditor' })
 
@@ -46,7 +47,7 @@ const props = defineProps({
 
 const emit = defineEmits(['update:modelValue'])
 
-const localStructure = reactive(hydrateStructureForEditor(props.modelValue))
+const localStructure = reactive<ComponentModelStructure>(hydrateStructureForEditor(props.modelValue))
 const previousLockedLabel = ref(props.rootTypeLabel || '')
 
 const { pieceTypes, loadPieceTypes } = usePieceTypes()
@@ -77,9 +78,14 @@ const syncRootType = () => {
   localStructure.typeComposantId = newTypeId
   localStructure.typeComposantLabel = newLabel
 
+  const match = availableComponentTypes.value.find((type) => type?.id === newTypeId)
+  if (match?.code) {
+    localStructure.familyCode = match.code
+  }
+
   const previousLabel = previousLockedLabel.value
-  if (!localStructure.name || localStructure.name === previousLabel || localStructure.name === '') {
-    localStructure.name = newLabel || localStructure.name
+  if (!localStructure.alias || localStructure.alias === previousLabel || localStructure.alias === '') {
+    localStructure.alias = newLabel || localStructure.alias
   }
 
   previousLockedLabel.value = newLabel
@@ -91,7 +97,12 @@ const syncFromProps = (value: any) => {
   const hydrated = hydrateStructureForEditor(value)
   localStructure.customFields = hydrated.customFields
   localStructure.pieces = hydrated.pieces
-  localStructure.subComponents = hydrated.subComponents
+  localStructure.subcomponents = hydrated.subcomponents
+  localStructure.typeComposantId = hydrated.typeComposantId
+  localStructure.typeComposantLabel = hydrated.typeComposantLabel
+  localStructure.modelId = hydrated.modelId
+  localStructure.familyCode = hydrated.familyCode
+  localStructure.alias = hydrated.alias
   lastEmitted = JSON.stringify(cloneStructure(value))
   syncRootType()
 }
diff --git a/app/components/MachinePrintSelectionNode.vue b/app/components/MachinePrintSelectionNode.vue
index 79a5835..561cafa 100644
--- a/app/components/MachinePrintSelectionNode.vue
+++ b/app/components/MachinePrintSelectionNode.vue
@@ -58,6 +58,6 @@ const props = defineProps({
   selection: { type: Object, required: true }
 })
 
-const childComponents = computed(() => props.component.subComponents || [])
+const childComponents = computed(() => props.component.subcomponents || props.component.subComponents || [])
 const childPieces = computed(() => props.component.pieces || [])
 </script>
diff --git a/app/components/ModelStructureViewer.vue b/app/components/ModelStructureViewer.vue
index 899593c..d5473dd 100644
--- a/app/components/ModelStructureViewer.vue
+++ b/app/components/ModelStructureViewer.vue
@@ -3,8 +3,8 @@
     <div class="flex flex-wrap items-center gap-2 text-sm text-gray-600">
       <span v-if="stats.customFields" class="badge badge-outline badge-sm">{{ stats.customFields }} champ(s)</span>
       <span v-if="stats.pieces" class="badge badge-outline badge-sm">{{ stats.pieces }} pièce(s)</span>
-      <span v-if="stats.subComponents" class="badge badge-outline badge-sm">{{ stats.subComponents }} sous-composant(s)</span>
-      <span v-if="!stats.customFields && !stats.pieces && !stats.subComponents" class="text-xs text-gray-500">
+      <span v-if="stats.subcomponents" class="badge badge-outline badge-sm">{{ stats.subcomponents }} sous-composant(s)</span>
+      <span v-if="!stats.customFields && !stats.pieces && !stats.subcomponents" class="text-xs text-gray-500">
         Structure vide
       </span>
     </div>
diff --git a/app/components/SkeletonComponentNodeSelector.vue b/app/components/SkeletonComponentNodeSelector.vue
index 9d087ec..867c317 100644
--- a/app/components/SkeletonComponentNodeSelector.vue
+++ b/app/components/SkeletonComponentNodeSelector.vue
@@ -5,7 +5,7 @@
         <div class="flex items-start justify-between gap-3">
           <div class="space-y-1">
             <h4 class="font-semibold text-sm">
-              {{ node.name || node.typeComposantLabel || 'Composant' }}
+              {{ node.alias || node.typeComposantLabel || 'Composant' }}
             </h4>
             <p class="text-xs text-gray-500">
               {{
@@ -46,15 +46,15 @@
         </div>
       </div>
 
-      <div v-if="hasPieces" class="space-y-2">
-        <h5 class="text-[11px] font-semibold uppercase text-gray-500">Pièces associées</h5>
-        <div
-          v-for="(piece, pieceIndex) in node.pieces"
-          :key="pieceIndex"
-          class="bg-base-200/60 border border-base-200 rounded-md p-3 space-y-2"
-        >
-          <div class="space-y-1">
-            <span class="font-medium text-sm">{{ piece.name || piece.typePieceLabel || 'Pièce' }}</span>
+        <div v-if="hasPieces" class="space-y-2">
+          <h5 class="text-[11px] font-semibold uppercase text-gray-500">Pièces associées</h5>
+          <div
+            v-for="(piece, pieceIndex) in node.pieces"
+            :key="pieceIndex"
+            class="bg-base-200/60 border border-base-200 rounded-md p-3 space-y-2"
+          >
+            <div class="space-y-1">
+            <span class="font-medium text-sm">{{ piece.typePieceLabel || 'Pièce' }}</span>
             <p class="text-[11px] text-gray-500">
               {{
                 piece.typePieceLabel
@@ -95,7 +95,7 @@
       <div v-if="hasSubComponents" class="space-y-3">
         <h5 class="text-[11px] font-semibold uppercase text-gray-500">Sous-composants</h5>
         <SkeletonComponentNodeSelector
-          v-for="(subComponent, index) in node.subComponents"
+          v-for="(subComponent, index) in (node.subcomponents || node.subComponents || [])"
           :key="index"
           :node="subComponent"
           :depth="depth + 1"
@@ -168,7 +168,10 @@ const selectedComponentModelLabel = computed(() => {
 })
 
 const hasPieces = computed(() => Array.isArray(props.node?.pieces) && props.node.pieces.length > 0)
-const hasSubComponents = computed(() => Array.isArray(props.node?.subComponents) && props.node.subComponents.length > 0)
+const hasSubComponents = computed(() => {
+  const list = props.node?.subcomponents || props.node?.subComponents || []
+  return Array.isArray(list) && list.length > 0
+})
 
 const getPieceModels = (typePieceId) => {
   if (!typePieceId) {
diff --git a/app/components/StructureNodeEditor.vue b/app/components/StructureNodeEditor.vue
index 417f7cf..9b3892b 100644
--- a/app/components/StructureNodeEditor.vue
+++ b/app/components/StructureNodeEditor.vue
@@ -28,6 +28,17 @@
             <p class="text-[11px] text-gray-500">
               {{ node.typeComposantId ? `Sélection : ${getComponentTypeLabel(node.typeComposantId) || 'Inconnue'}` : 'Aucune famille sélectionnée' }}
             </p>
+            <div v-if="!isRoot" class="form-control mt-2">
+              <label class="label py-1">
+                <span class="label-text text-[11px]">Alias (optionnel)</span>
+              </label>
+              <input
+                v-model="node.alias"
+                type="text"
+                class="input input-bordered input-xs"
+                placeholder="Alias du sous-composant"
+              />
+            </div>
           </template>
           <template v-else>
             <div class="input input-bordered input-sm bg-base-200 flex items-center">
@@ -170,12 +181,12 @@
           <p v-if="!isRoot" class="text-[11px] text-gray-500">
             Sélectionnez uniquement la famille de ce sous-composant ; il sera configuré via son propre modèle.
           </p>
-          <p v-if="!(node.subComponents?.length)" class="text-xs text-gray-500">
+          <p v-if="!(node.subcomponents?.length)" class="text-xs text-gray-500">
             Aucun sous-composant défini.
           </p>
           <div v-else class="space-y-3">
             <StructureNodeEditor
-              v-for="(subComponent, index) in node.subComponents"
+              v-for="(subComponent, index) in node.subcomponents"
               :key="`sub-${index}`"
               :node="subComponent"
               :depth="depth + 1"
@@ -194,6 +205,7 @@
 import { computed, watch } from 'vue'
 import IconLucidePlus from '~icons/lucide/plus'
 import IconLucideTrash from '~icons/lucide/trash'
+import type { ComponentModelPiece, ComponentModelStructureNode } from '~/shared/types/inventory'
 
 defineOptions({ name: 'StructureNodeEditor' })
 
@@ -203,8 +215,13 @@ type ModelTypeOption = {
   code?: string | null
 }
 
+type EditableStructureNode = ComponentModelStructureNode & {
+  customFields?: any[]
+  pieces?: ComponentModelPiece[]
+}
+
 const props = withDefaults(defineProps<{
-  node: Record<string, any>
+  node: EditableStructureNode
   depth?: number
   componentTypes?: ModelTypeOption[]
   pieceTypes?: ModelTypeOption[]
@@ -281,23 +298,31 @@ const formatComponentTypeOption = (type: ModelTypeOption | undefined | null) =>
 const formatPieceTypeOption = (type: ModelTypeOption | undefined | null) =>
   formatModelTypeOption(type)
 
-const ensureArray = (key: 'customFields' | 'pieces' | 'subComponents') => {
-  if (!Array.isArray(props.node[key])) {
-    props.node[key] = []
+const ensureArray = (key: 'customFields' | 'pieces' | 'subcomponents') => {
+  if (!Array.isArray((props.node as any)[key])) {
+    if (key === 'subcomponents') {
+      props.node.subcomponents = []
+    } else {
+      (props.node as any)[key] = []
+    }
   }
 }
 
-const syncComponentType = (component: any) => {
+const syncComponentType = (component: EditableStructureNode) => {
   if (!component) {
     return
   }
   if (props.lockType && props.isRoot) {
     if (props.lockedTypeLabel) {
       component.typeComposantLabel = props.lockedTypeLabel
-      if (!component.name || component.name === component.typeComposantLabel) {
-        component.name = props.lockedTypeLabel
+      if (!component.alias || component.alias === component.typeComposantLabel) {
+        component.alias = props.lockedTypeLabel
       }
     }
+    if (component.typeComposantId) {
+      const option = componentTypeMap.value.get(component.typeComposantId)
+      component.familyCode = option?.code ?? component.familyCode
+    }
     return
   }
   const id = typeof component.typeComposantId === 'string'
@@ -306,29 +331,31 @@ const syncComponentType = (component: any) => {
 
   if (!id) {
     component.typeComposantLabel = ''
-    component.name = ''
+    component.familyCode = ''
     return
   }
 
   const option = componentTypeMap.value.get(id)
   if (!option) {
     component.typeComposantLabel = ''
-    component.name = ''
+    component.familyCode = ''
     return
   }
 
   component.typeComposantLabel = formatModelTypeOption(option)
-  component.name = option.name || component.typeComposantLabel
+  component.familyCode = option.code ?? component.familyCode
+  if (!component.alias || component.alias === '' || component.alias === lockedTypeDisplay.value) {
+    component.alias = option.name || component.typeComposantLabel
+  }
 }
 
-const updatePieceTypeLabel = (piece: any) => {
+const updatePieceTypeLabel = (piece: ComponentModelPiece & Record<string, any>) => {
   if (!piece) return
 
   if (piece.typePieceId) {
     const option = pieceTypeMap.value.get(piece.typePieceId)
     if (option) {
       piece.typePieceLabel = formatPieceTypeOption(option)
-      piece.name = option.name || formatPieceTypeOption(option)
       return
     }
   }
@@ -345,15 +372,10 @@ const updatePieceTypeLabel = (piece: any) => {
       if (match) {
         piece.typePieceId = match.id
         piece.typePieceLabel = formatPieceTypeOption(match)
-        piece.name = match.name || formatPieceTypeOption(match)
         return
       }
     }
   }
-
-  if (!piece.name) {
-    piece.name = piece.typePieceLabel || ''
-  }
 }
 
 const syncPieceLabels = (pieces?: any[]) => {
@@ -369,25 +391,22 @@ const handleComponentTypeSelect = (component: any) => {
   syncComponentType(component)
 }
 
-const handlePieceTypeSelect = (piece: any) => {
+const handlePieceTypeSelect = (piece: ComponentModelPiece & Record<string, any>) => {
   if (!piece) {
     return
   }
   const id = typeof piece.typePieceId === 'string' ? piece.typePieceId : ''
   if (!id) {
     piece.typePieceLabel = ''
-    piece.name = ''
     return
   }
   const option = pieceTypeMap.value.get(id)
   if (!option) {
     piece.typePieceId = ''
     piece.typePieceLabel = ''
-    piece.name = ''
     return
   }
   piece.typePieceLabel = formatPieceTypeOption(option)
-  piece.name = option.name || piece.typePieceLabel
 }
 
 const addCustomField = () => {
@@ -409,9 +428,9 @@ const removeCustomField = (index: number) => {
 const addPiece = () => {
   ensureArray('pieces')
   props.node.pieces.push({
-    name: '',
     typePieceId: '',
     typePieceLabel: '',
+    reference: '',
   })
 }
 
@@ -421,17 +440,20 @@ const removePiece = (index: number) => {
 }
 
 const addSubComponent = () => {
-  ensureArray('subComponents')
-  props.node.subComponents.push({
-    name: '',
+  ensureArray('subcomponents')
+  props.node.subcomponents.push({
     typeComposantId: '',
     typeComposantLabel: '',
+    modelId: '',
+    familyCode: '',
+    alias: '',
+    subcomponents: [],
   })
 }
 
 const removeSubComponent = (index: number) => {
-  if (!Array.isArray(props.node.subComponents)) return
-  props.node.subComponents.splice(index, 1)
+  if (!Array.isArray(props.node.subcomponents)) return
+  props.node.subcomponents.splice(index, 1)
 }
 
 watch(componentTypes, () => {
@@ -463,8 +485,12 @@ watch(
     if (props.lockType && props.isRoot) {
       const label = props.lockedTypeLabel || lockedTypeDisplay.value
       props.node.typeComposantLabel = label
-      if (label && (!props.node.name || props.node.name === lockedTypeDisplay.value)) {
-        props.node.name = label
+      if (label && (!props.node.alias || props.node.alias === lockedTypeDisplay.value)) {
+        props.node.alias = label
+      }
+      if (props.node.typeComposantId) {
+        const option = componentTypeMap.value.get(props.node.typeComposantId)
+        props.node.familyCode = option?.code ?? props.node.familyCode
       }
     }
   },
diff --git a/app/pages/component-catalog.vue b/app/pages/component-catalog.vue
index a678a18..8efd920 100644
--- a/app/pages/component-catalog.vue
+++ b/app/pages/component-catalog.vue
@@ -214,6 +214,7 @@ import {
   cloneStructure,
   normalizeStructureForSave,
 } from '~/shared/modelUtils'
+import { componentModelStructureValidator } from '~/shared/types/inventory'
 import { formatFrenchDate } from '~/utils/date'
 import IconLucidePlus from '~icons/lucide/plus'
 import IconLucideLayers from '~icons/lucide/layers'
@@ -328,12 +329,19 @@ const handleSubmit = async () => {
 
   form.submitting = true
   try {
+    const normalizedStructure = normalizeStructureForSave(form.data.structure)
+    const validationResult = componentModelStructureValidator.safeParse(normalizedStructure)
+    if (!validationResult.success) {
+      showError(`Structure invalide: ${validationResult.issues.join(', ')}`)
+      return
+    }
+
     if (form.mode === 'create') {
       const result = await createComponentModel({
         name: form.data.name.trim(),
         description: form.data.description.trim() || undefined,
         typeComposantId: form.data.typeComposantId,
-        structure: normalizeStructureForSave(form.data.structure),
+        structure: normalizedStructure,
       })
       if (!result.success) {
         showError(result.error || 'Impossible de créer le modèle')
@@ -345,7 +353,7 @@ const handleSubmit = async () => {
         name: form.data.name.trim(),
         description: form.data.description.trim() || undefined,
         typeComposantId: form.data.typeComposantId,
-        structure: normalizeStructureForSave(form.data.structure),
+        structure: normalizedStructure,
       })
       if (!result.success) {
         showError(result.error || 'Impossible de mettre à jour le modèle')
diff --git a/app/shared/modelUtils.ts b/app/shared/modelUtils.ts
index 2760008..6f2dc51 100644
--- a/app/shared/modelUtils.ts
+++ b/app/shared/modelUtils.ts
@@ -1,3 +1,11 @@
+import {
+  createEmptyComponentModelStructure,
+  type ComponentModelCustomField,
+  type ComponentModelPiece,
+  type ComponentModelStructure,
+  type ComponentModelStructureNode,
+} from './types/inventory'
+
 export const isPlainObject = (value: unknown): value is Record<string, unknown> => {
   return value !== null && typeof value === 'object' && !Array.isArray(value)
 }
@@ -5,24 +13,50 @@ export const isPlainObject = (value: unknown): value is Record<string, unknown>
 export interface ModelStructurePreview {
   customFields: number
   pieces: number
-  subComponents: number
+  subcomponents: number
 }
 
-export const defaultStructure = () => ({
-  customFields: [],
-  pieces: [],
-  subComponents: [],
+export const defaultStructure = (): ComponentModelStructure => ({
+  ...createEmptyComponentModelStructure(),
 })
 
-export const cloneStructure = (input: any) => {
+const ensureStructureShape = (input: any): ComponentModelStructure => {
+  const base = createEmptyComponentModelStructure()
+  if (!isPlainObject(input)) {
+    return base
+  }
+
+  const clone: ComponentModelStructure = {
+    ...base,
+    customFields: Array.isArray((input as any).customFields) ? (input as any).customFields : [],
+    pieces: Array.isArray((input as any).pieces) ? (input as any).pieces : [],
+    subcomponents: Array.isArray((input as any).subcomponents)
+      ? (input as any).subcomponents
+      : Array.isArray((input as any).subComponents)
+        ? (input as any).subComponents
+        : [],
+    typeComposantId: typeof (input as any).typeComposantId === 'string' ? (input as any).typeComposantId : undefined,
+    typeComposantLabel: typeof (input as any).typeComposantLabel === 'string'
+      ? (input as any).typeComposantLabel
+      : undefined,
+    modelId: typeof (input as any).modelId === 'string' ? (input as any).modelId : undefined,
+    familyCode: typeof (input as any).familyCode === 'string' ? (input as any).familyCode : undefined,
+    alias: typeof (input as any).alias === 'string' ? (input as any).alias : undefined,
+  }
+
+  return clone
+}
+
+export const cloneStructure = (input: any): ComponentModelStructure => {
   try {
-    return JSON.parse(JSON.stringify(input ?? defaultStructure()))
+    const cloned = JSON.parse(JSON.stringify(input ?? defaultStructure()))
+    return ensureStructureShape(cloned)
   } catch (error) {
     return defaultStructure()
   }
 }
 
-const sanitizeCustomFields = (fields: any[]): any[] => {
+const sanitizeCustomFields = (fields: any[]): ComponentModelCustomField[] => {
   if (!Array.isArray(fields)) {
     return []
   }
@@ -51,16 +85,16 @@ const sanitizeCustomFields = (fields: any[]): any[] => {
         options = parsed.length > 0 ? parsed : undefined
       }
 
-      const result: Record<string, unknown> = { name, type, required }
+      const result: ComponentModelCustomField = { name, type, required }
       if (options) {
         result.options = options
       }
       return result
     })
-    .filter(Boolean)
+    .filter((field): field is ComponentModelCustomField => !!field)
 }
 
-const sanitizePieces = (pieces: any[]): any[] => {
+const sanitizePieces = (pieces: any[]): ComponentModelPiece[] => {
   if (!Array.isArray(pieces)) {
     return []
   }
@@ -81,26 +115,18 @@ const sanitizePieces = (pieces: any[]): any[] => {
           : ''
       const typePieceLabel = rawTypePieceLabel.length > 0 ? rawTypePieceLabel : undefined
 
-      const rawName = typeof piece?.name === 'string' ? piece.name.trim() : ''
-      const name = rawName || typePieceLabel || ''
-      if (!name) {
-        return null
-      }
-
       const reference = typeof piece?.reference === 'string' && piece.reference.trim().length > 0
         ? piece.reference.trim()
         : undefined
 
-      const quantity = Number(piece?.quantity)
-      const normalizedQuantity = Number.isFinite(quantity) && quantity > 0 ? quantity : undefined
+      if (!typePieceId && !typePieceLabel && !reference) {
+        return null
+      }
 
-      const result: Record<string, unknown> = { name }
+      const result: ComponentModelPiece = {}
       if (reference !== undefined) {
         result.reference = reference
       }
-      if (normalizedQuantity !== undefined) {
-        result.quantity = normalizedQuantity
-      }
       if (typePieceId) {
         result.typePieceId = typePieceId
       }
@@ -109,10 +135,10 @@ const sanitizePieces = (pieces: any[]): any[] => {
       }
       return result
     })
-    .filter(Boolean)
+    .filter((piece): piece is ComponentModelPiece => !!piece)
 }
 
-const sanitizeSubComponents = (components: any[]): any[] => {
+const sanitizeSubcomponents = (components: any[]): ComponentModelStructureNode[] => {
   if (!Array.isArray(components)) {
     return []
   }
@@ -126,63 +152,68 @@ const sanitizeSubComponents = (components: any[]): any[] => {
           : ''
       const typeComposantId = rawTypeComposantId.length > 0 ? rawTypeComposantId : undefined
 
-      const rawTypeComposantLabel = typeof component?.typeComposantLabel === 'string'
+      const modelId = typeof component?.modelId === 'string' && component.modelId.trim().length > 0
+        ? component.modelId.trim()
+        : undefined
+
+      const familyCode = typeof component?.familyCode === 'string' && component.familyCode.trim().length > 0
+        ? component.familyCode.trim()
+        : undefined
+
+      const alias = typeof component?.alias === 'string' && component.alias.trim().length > 0
+        ? component.alias.trim()
+        : undefined
+
+      if (!typeComposantId && !modelId && !familyCode) {
+        return null
+      }
+
+      const result: ComponentModelStructureNode = {
+        subcomponents: sanitizeSubcomponents(
+          Array.isArray(component?.subcomponents)
+            ? component.subcomponents
+            : component?.subComponents,
+        ),
+      }
+
+      if (typeComposantId) {
+        result.typeComposantId = typeComposantId
+      }
+      const typeComposantLabel = typeof component?.typeComposantLabel === 'string'
         ? component.typeComposantLabel.trim()
         : typeof component?.typeComposant?.name === 'string'
           ? component.typeComposant.name.trim()
           : ''
-      const typeComposantLabel = rawTypeComposantLabel.length > 0 ? rawTypeComposantLabel : undefined
-
-      const rawName = typeof component?.name === 'string' ? component.name.trim() : ''
-      const name = rawName || typeComposantLabel || ''
-      if (!name) {
-        return null
-      }
-
-      const description = typeof component?.description === 'string' && component.description.trim().length > 0
-        ? component.description.trim()
-        : undefined
-
-      const quantity = Number(component?.quantity)
-      const normalizedQuantity = Number.isFinite(quantity) && quantity > 0 ? quantity : undefined
-
-      const result: Record<string, unknown> = {
-        name,
-      }
-
-      if (description !== undefined) {
-        result.description = description
-      }
-      if (normalizedQuantity !== undefined) {
-        result.quantity = normalizedQuantity
-      }
-      if (typeComposantId) {
-        result.typeComposantId = typeComposantId
-      }
       if (typeComposantLabel) {
         result.typeComposantLabel = typeComposantLabel
       }
-
-      const nestedSubComponents = sanitizeSubComponents(component?.subComponents)
-      if (nestedSubComponents.length > 0) {
-        result.subComponents = nestedSubComponents
-      } else {
-        result.subComponents = []
+      if (modelId) {
+        result.modelId = modelId
+      }
+      if (familyCode) {
+        result.familyCode = familyCode
+      }
+      if (alias) {
+        result.alias = alias
       }
 
-      // Sub components only carry structural info (they will be resolved via their own models)
       return result
     })
-    .filter(Boolean)
+    .filter((component): component is ComponentModelStructureNode => !!component)
 }
 
-export const normalizeStructureForSave = (input: any) => {
+export const normalizeStructureForSave = (input: any): ComponentModelStructure => {
   const source = cloneStructure(input)
 
   return {
     customFields: sanitizeCustomFields(source.customFields),
     pieces: sanitizePieces(source.pieces),
-    subComponents: sanitizeSubComponents(source.subComponents),
+    subcomponents: sanitizeSubcomponents(source.subcomponents),
+    typeComposantId: source.typeComposantId,
+    typeComposantLabel: source.typeComposantLabel,
+    modelId: source.modelId,
+    familyCode: source.familyCode,
+    alias: source.alias,
   }
 }
 
@@ -200,43 +231,50 @@ const hydrateCustomFields = (fields: any[]): any[] => {
   }))
 }
 
-const hydratePieces = (pieces: any[]): any[] => {
+const hydratePieces = (pieces: any[]): ComponentModelPiece[] => {
   if (!Array.isArray(pieces)) {
     return []
   }
 
   return pieces.map((piece) => ({
-    name: piece?.name ?? piece?.typePiece?.name ?? piece?.typePieceLabel ?? '',
-    reference: piece?.reference ?? '',
-    quantity: piece?.quantity ?? piece?.quantite ?? undefined,
     typePieceId: piece?.typePieceId ?? piece?.typePiece?.id ?? '',
     typePieceLabel: piece?.typePieceLabel ?? piece?.typePiece?.name ?? '',
+    reference: piece?.reference ?? '',
   }))
 }
 
-const hydrateSubComponents = (components: any[]): any[] => {
+const hydrateSubcomponents = (components: any[]): ComponentModelStructureNode[] => {
   if (!Array.isArray(components)) {
     return []
   }
 
   return components.map((component) => ({
-    name: component?.name ?? component?.typeComposant?.name ?? component?.typeComposantLabel ?? '',
-    description: component?.description ?? '',
-    quantity: component?.quantity ?? component?.quantite ?? undefined,
     typeComposantId: component?.typeComposantId ?? component?.typeComposant?.id ?? '',
     typeComposantLabel: component?.typeComposantLabel ?? component?.typeComposant?.name ?? '',
-    customFields: [],
-    pieces: [],
-    subComponents: hydrateSubComponents(component?.subComponents),
+    modelId: component?.modelId ?? '',
+    familyCode: component?.familyCode ?? component?.typeComposant?.code ?? '',
+    alias: component?.alias ?? component?.name ?? '',
+    subcomponents: hydrateSubcomponents(
+      Array.isArray(component?.subcomponents)
+        ? component.subcomponents
+        : component?.subComponents,
+    ),
   }))
 }
 
-export const hydrateStructureForEditor = (input: any) => {
+export const hydrateStructureForEditor = (input: any): ComponentModelStructure => {
   const source = cloneStructure(input)
   return {
     customFields: hydrateCustomFields(source.customFields),
     pieces: hydratePieces(source.pieces),
-    subComponents: hydrateSubComponents(source.subComponents),
+    subcomponents: hydrateSubcomponents(
+      Array.isArray(source.subcomponents) ? source.subcomponents : (source as any).subComponents,
+    ),
+    typeComposantId: source.typeComposantId ?? '',
+    typeComposantLabel: source.typeComposantLabel ?? '',
+    modelId: source.modelId ?? '',
+    familyCode: source.familyCode ?? '',
+    alias: source.alias ?? '',
   }
 }
 
@@ -263,32 +301,32 @@ const mapComponentCustomFields = (fields: any[]) => {
   }))
 }
 
-const mapComponentPieces = (pieces: any[]) => {
+const mapComponentPieces = (pieces: any[]): ComponentModelPiece[] => {
   if (!Array.isArray(pieces)) {
     return []
   }
   return pieces.map((piece) => ({
-    name: piece?.name ?? piece?.typePiece?.name ?? '',
     reference: piece?.reference ?? '',
-    quantity: piece?.quantity ?? piece?.quantite ?? undefined,
     typePieceId: piece?.typePieceId ?? piece?.typePiece?.id ?? '',
     typePieceLabel: piece?.typePieceLabel ?? piece?.typePiece?.name ?? '',
   }))
 }
 
-const mapSubComponents = (components: any[]): any[] => {
+const mapSubcomponents = (components: any[]): ComponentModelStructureNode[] => {
   if (!Array.isArray(components)) {
     return []
   }
   return components.map((component) => ({
-    name: component?.name ?? component?.typeComposant?.name ?? '',
-    description: component?.description ?? '',
-    quantity: component?.quantity ?? component?.quantite ?? undefined,
     typeComposantId: component?.typeComposantId ?? component?.typeComposant?.id ?? '',
     typeComposantLabel: component?.typeComposantLabel ?? component?.typeComposant?.name ?? '',
-    customFields: [],
-    pieces: [],
-    subComponents: mapSubComponents(component?.subComponents),
+    modelId: component?.modelId ?? '',
+    familyCode: component?.familyCode ?? component?.typeComposant?.code ?? '',
+    alias: component?.alias ?? component?.name ?? '',
+    subcomponents: mapSubcomponents(
+      Array.isArray(component?.subcomponents)
+        ? component.subcomponents
+        : component?.subComponents,
+    ),
   }))
 }
 
@@ -300,7 +338,16 @@ export const extractStructureFromComponent = (component: any) => {
   const raw = {
     customFields: mapComponentCustomFields(component.customFields),
     pieces: mapComponentPieces(component.pieces),
-    subComponents: mapSubComponents(component.subComponents),
+    subcomponents: mapSubcomponents(
+      Array.isArray(component?.subcomponents)
+        ? component.subcomponents
+        : component?.subComponents,
+    ),
+    typeComposantId: component?.typeComposantId ?? component?.typeComposant?.id ?? '',
+    typeComposantLabel: component?.typeComposant?.name ?? component?.typeComposantLabel ?? '',
+    modelId: component?.modelId ?? '',
+    familyCode: component?.familyCode ?? component?.typeComposant?.code ?? '',
+    alias: component?.alias ?? component?.name ?? '',
   }
 
   return normalizeStructureForSave(raw)
@@ -308,25 +355,29 @@ export const extractStructureFromComponent = (component: any) => {
 
 export const computeStructureStats = (structure: any): ModelStructurePreview => {
   if (!structure || typeof structure !== 'object') {
-    return { customFields: 0, pieces: 0, subComponents: 0 }
+    return { customFields: 0, pieces: 0, subcomponents: 0 }
   }
 
   return {
     customFields: Array.isArray(structure.customFields) ? structure.customFields.length : 0,
     pieces: Array.isArray(structure.pieces) ? structure.pieces.length : 0,
-    subComponents: Array.isArray(structure.subComponents) ? structure.subComponents.length : 0,
+    subcomponents: Array.isArray(structure.subcomponents)
+      ? structure.subcomponents.length
+      : Array.isArray(structure.subComponents)
+        ? structure.subComponents.length
+        : 0,
   }
 }
 
 export const formatStructurePreview = (structure: any) => {
   const stats = computeStructureStats(structure)
-  if (!stats.customFields && !stats.pieces && !stats.subComponents) {
+  if (!stats.customFields && !stats.pieces && !stats.subcomponents) {
     return 'Structure vide'
   }
 
   const segments: string[] = []
   if (stats.customFields) segments.push(`${stats.customFields} champ(s)`)
   if (stats.pieces) segments.push(`${stats.pieces} pièce(s)`)
-  if (stats.subComponents) segments.push(`${stats.subComponents} sous-composant(s)`)
+  if (stats.subcomponents) segments.push(`${stats.subcomponents} sous-composant(s)`)
   return segments.join(' • ')
 }
diff --git a/app/shared/types/inventory.ts b/app/shared/types/inventory.ts
new file mode 100644
index 0000000..0f5f0fe
--- /dev/null
+++ b/app/shared/types/inventory.ts
@@ -0,0 +1,221 @@
+export type ComponentModelCustomFieldType = 'text' | 'number' | 'select' | 'boolean' | 'date'
+
+export interface ComponentModelCustomField {
+  name: string
+  type: ComponentModelCustomFieldType
+  required: boolean
+  options?: string[]
+}
+
+export interface ComponentModelPiece {
+  typePieceId?: string
+  typePieceLabel?: string
+  reference?: string
+}
+
+export interface ComponentModelStructureNode {
+  typeComposantId?: string
+  typeComposantLabel?: string
+  modelId?: string
+  familyCode?: string
+  alias?: string
+  subcomponents: ComponentModelStructureNode[]
+}
+
+export interface ComponentModelStructure extends ComponentModelStructureNode {
+  customFields: ComponentModelCustomField[]
+  pieces: ComponentModelPiece[]
+}
+
+const FIELD_TYPES: ComponentModelCustomFieldType[] = ['text', 'number', 'select', 'boolean', 'date']
+
+const isPlainObject = (value: unknown): value is Record<string, unknown> => {
+  return value !== null && typeof value === 'object' && !Array.isArray(value)
+}
+
+const isNonEmptyString = (value: unknown): value is string => typeof value === 'string' && value.trim().length > 0
+
+const ensureString = (value: unknown): string | undefined => {
+  if (!isNonEmptyString(value)) {
+    return undefined
+  }
+  return value.trim()
+}
+
+const validateCustomField = (
+  value: unknown,
+  issues: string[],
+  path: string,
+): ComponentModelCustomField | null => {
+  if (!isPlainObject(value)) {
+    issues.push(`${path}: expected object`)
+    return null
+  }
+
+  const name = ensureString(value.name)
+  if (!name) {
+    issues.push(`${path}.name: valeur manquante`)
+    return null
+  }
+
+  const type = isNonEmptyString(value.type) && FIELD_TYPES.includes(value.type as ComponentModelCustomFieldType)
+    ? (value.type as ComponentModelCustomFieldType)
+    : 'text'
+
+  const required = !!value.required
+
+  let options: string[] | undefined
+  if (value.options !== undefined) {
+    if (!Array.isArray(value.options)) {
+      issues.push(`${path}.options: attendu tableau`)
+    } else {
+      const parsed = value.options.map(ensureString).filter((option): option is string => !!option)
+      if (parsed.length) {
+        options = parsed
+      }
+    }
+  }
+
+  return { name, type, required, ...(options ? { options } : {}) }
+}
+
+const validatePiece = (
+  value: unknown,
+  issues: string[],
+  path: string,
+): ComponentModelPiece | null => {
+  if (!isPlainObject(value)) {
+    issues.push(`${path}: expected object`)
+    return null
+  }
+
+  const typePieceId = ensureString(value.typePieceId)
+  const typePieceLabel = ensureString(value.typePieceLabel)
+  const reference = ensureString(value.reference)
+
+  if (!typePieceId && !typePieceLabel && !reference) {
+    issues.push(`${path}: au moins un identifiant ou libellé de pièce est requis`)
+    return null
+  }
+
+  return {
+    ...(typePieceId ? { typePieceId } : {}),
+    ...(typePieceLabel ? { typePieceLabel } : {}),
+    ...(reference ? { reference } : {}),
+  }
+}
+
+const validateStructureNode = (
+  value: unknown,
+  issues: string[],
+  path: string,
+): ComponentModelStructureNode | null => {
+  if (!isPlainObject(value)) {
+    issues.push(`${path}: expected object`)
+    return null
+  }
+
+  const typeComposantId = ensureString(value.typeComposantId)
+  const typeComposantLabel = ensureString(value.typeComposantLabel)
+  const modelId = ensureString(value.modelId)
+  const familyCode = ensureString(value.familyCode)
+  const alias = ensureString(value.alias)
+
+  const rawSubcomponents = Array.isArray((value as any).subcomponents)
+    ? (value as any).subcomponents
+    : []
+
+  const subcomponents: ComponentModelStructureNode[] = []
+  rawSubcomponents.forEach((subValue, index) => {
+    const parsed = validateStructureNode(subValue, issues, `${path}.subcomponents[${index}]`)
+    if (parsed) {
+      subcomponents.push(parsed)
+    }
+  })
+
+  return {
+    ...(typeComposantId ? { typeComposantId } : {}),
+    ...(typeComposantLabel ? { typeComposantLabel } : {}),
+    ...(modelId ? { modelId } : {}),
+    ...(familyCode ? { familyCode } : {}),
+    ...(alias ? { alias } : {}),
+    subcomponents,
+  }
+}
+
+export interface ComponentModelStructureValidationSuccess {
+  success: true
+  data: ComponentModelStructure
+}
+
+export interface ComponentModelStructureValidationFailure {
+  success: false
+  issues: string[]
+}
+
+export type ComponentModelStructureValidationResult =
+  | ComponentModelStructureValidationSuccess
+  | ComponentModelStructureValidationFailure
+
+export const componentModelStructureValidator = {
+  safeParse(value: unknown): ComponentModelStructureValidationResult {
+    const issues: string[] = []
+
+    if (!isPlainObject(value)) {
+      issues.push('Structure invalide: attendu un objet')
+      return { success: false, issues }
+    }
+
+    const customFieldsInput = Array.isArray(value.customFields) ? value.customFields : []
+    const piecesInput = Array.isArray(value.pieces) ? value.pieces : []
+
+    const customFields: ComponentModelCustomField[] = []
+    customFieldsInput.forEach((field, index) => {
+      const parsed = validateCustomField(field, issues, `customFields[${index}]`)
+      if (parsed) {
+        customFields.push(parsed)
+      }
+    })
+
+    const pieces: ComponentModelPiece[] = []
+    piecesInput.forEach((piece, index) => {
+      const parsed = validatePiece(piece, issues, `pieces[${index}]`)
+      if (parsed) {
+        pieces.push(parsed)
+      }
+    })
+
+    const node = validateStructureNode(value, issues, 'structure')
+
+    if (!node) {
+      issues.push('Structure racine invalide')
+      return { success: false, issues }
+    }
+
+    if (issues.length > 0) {
+      return { success: false, issues }
+    }
+
+    return {
+      success: true,
+      data: {
+        ...node,
+        customFields,
+        pieces,
+      },
+    }
+  },
+  parse(value: unknown): ComponentModelStructure {
+    const result = this.safeParse(value)
+    if (!result.success) {
+      throw new Error(result.issues.join('\n'))
+    }
+    return result.data
+  },
+}
+
+export const createEmptyComponentModelStructure = (): ComponentModelStructure => ({
+  customFields: [],
+  pieces: [],
+  subcomponents: [],
+})