diff --git a/app/Http/Controllers/Api/V1/Design/DesignModelController.php b/app/Http/Controllers/Api/V1/Design/DesignModelController.php
index 2c16a31..470f786 100644
--- a/app/Http/Controllers/Api/V1/Design/DesignModelController.php
+++ b/app/Http/Controllers/Api/V1/Design/DesignModelController.php
@@ -5,7 +5,9 @@
 use App\Helpers\ApiResponse;
 use App\Http\Controllers\Controller;
 use App\Services\Design\ModelService;
-use Illuminate\Http\Request;
+use App\Http\Requests\Common\PaginateRequest;
+use App\Http\Requests\Design\Model\StoreRequest;
+use App\Http\Requests\Design\Model\UpdateRequest;
 
 class DesignModelController extends Controller
 {
@@ -13,48 +15,35 @@ public function __construct(
         protected ModelService $service
     ) {}
 
-    public function index(Request $request)
+    public function index(PaginateRequest $request)
     {
         return ApiResponse::handle(function () use ($request) {
-            $q    = $request->query('q', '');
-            $page = (int) $request->query('page', 1);
-            $size = (int) $request->query('size', 20);
+            $p    = $request->validatedOrDefaults();
+            $q    = $p['q'] ?? '';
+            $page = (int) $p['page'];
+            $size = (int) $p['size'];
+
+            // 현재 서비스 시그니처가 list($q, $page, $size)이므로 정합 유지
             return $this->service->list($q, $page, $size);
         }, __('message.fetched'));
     }
 
-    public function store(Request $request)
+    public function store(StoreRequest $request)
     {
         return ApiResponse::handle(function () use ($request) {
-            $payload = $request->validate([
-                'code'        => 'required|string|max:100',
-                'name'        => 'required|string|max:200',
-                'category_id' => 'nullable|integer',
-                'lifecycle'   => 'nullable|string|max:30',
-                'description' => 'nullable|string',
-                'is_active'   => 'boolean',
-            ]);
-            return $this->service->create($payload);
+            return $this->service->create($request->validated());
         }, __('message.created'));
     }
 
     public function show(int $id)
     {
-        return ApiResponse::handle(fn() => $this->service->find($id), __('message.fetched'));
+        return ApiResponse::handle(fn () => $this->service->find($id), __('message.fetched'));
     }
 
-    public function update(Request $request, int $id)
+    public function update(UpdateRequest $request, int $id)
     {
         return ApiResponse::handle(function () use ($request, $id) {
-            $payload = $request->validate([
-                'code'        => 'sometimes|string|max:100',
-                'name'        => 'sometimes|string|max:200',
-                'category_id' => 'nullable|integer',
-                'lifecycle'   => 'nullable|string|max:30',
-                'description' => 'nullable|string',
-                'is_active'   => 'boolean',
-            ]);
-            return $this->service->update($id, $payload);
+            return $this->service->update($id, $request->validated());
         }, __('message.updated'));
     }
 
diff --git a/app/Http/Requests/Common/PaginateRequest.php b/app/Http/Requests/Common/PaginateRequest.php
new file mode 100644
index 0000000..28e8024
--- /dev/null
+++ b/app/Http/Requests/Common/PaginateRequest.php
@@ -0,0 +1,29 @@
+<?php
+namespace App\Http\Requests\Common;
+
+use Illuminate\Foundation\Http\FormRequest;
+
+class PaginateRequest extends FormRequest
+{
+    public function authorize(): bool { return true; }
+
+    public function rules(): array
+    {
+        return [
+            'page'  => 'nullable|integer|min:1',
+            'size'  => 'nullable|integer|min:1|max:100',
+            'q'     => 'nullable|string|max:100',
+            'sort'  => 'nullable|string|in:id,code,name,created_at',
+            'order' => 'nullable|string|in:asc,desc',
+        ];
+    }
+
+    public function validatedOrDefaults(): array
+    {
+        $v = $this->validated();
+        $v['page']  = $v['page']  ?? 1;
+        $v['size']  = $v['size']  ?? 20;
+        $v['order'] = $v['order'] ?? 'desc';
+        return $v;
+    }
+}
diff --git a/app/Http/Requests/Design/BomTemplate/ReplaceItemsRequest.php b/app/Http/Requests/Design/BomTemplate/ReplaceItemsRequest.php
new file mode 100644
index 0000000..ec90832
--- /dev/null
+++ b/app/Http/Requests/Design/BomTemplate/ReplaceItemsRequest.php
@@ -0,0 +1,28 @@
+<?php
+namespace App\Http\Requests\Design\BomTemplate;
+
+use Illuminate\Foundation\Http\FormRequest;
+use App\Support\Validation\BomItemRules;
+
+class ReplaceItemsRequest extends FormRequest
+{
+    public function authorize(): bool { return true; }
+
+    public function rules(): array
+    {
+        $itemRules = collect(BomItemRules::base())
+            ->mapWithKeys(fn($rule, $key) => ["items.*.$key" => $rule])
+            ->all();
+
+        return ['items' => 'required|array|min:1'] + $itemRules;
+    }
+
+    public function messages(): array
+    {
+        return [
+            'items.required' => __('validation.required', ['attribute' => 'items']),
+            'items.array'    => __('validation.array', ['attribute' => 'items']),
+            'items.min'      => __('validation.min.array', ['attribute' => 'items', 'min' => 1]),
+        ];
+    }
+}
diff --git a/app/Http/Requests/Design/BomTemplate/UpsertRequest.php b/app/Http/Requests/Design/BomTemplate/UpsertRequest.php
new file mode 100644
index 0000000..1a73904
--- /dev/null
+++ b/app/Http/Requests/Design/BomTemplate/UpsertRequest.php
@@ -0,0 +1,22 @@
+<?php
+
+namespace App\Http\Requests\Design\BomTemplate;
+
+use Illuminate\Foundation\Http\FormRequest;
+
+class UpsertRequest extends FormRequest
+{
+    public function authorize(): bool
+    {
+        return true;
+    }
+
+    public function rules(): array
+    {
+        return [
+            'name' => 'required|string|max:100',
+            'is_primary' => 'nullable|boolean',
+            'notes' => 'nullable|string',
+        ];
+    }
+}
diff --git a/app/Http/Requests/Design/Model/StoreRequest.php b/app/Http/Requests/Design/Model/StoreRequest.php
new file mode 100644
index 0000000..37a70f6
--- /dev/null
+++ b/app/Http/Requests/Design/Model/StoreRequest.php
@@ -0,0 +1,36 @@
+<?php
+namespace App\Http\Requests\Design\Model;
+
+use Illuminate\Foundation\Http\FormRequest;
+
+class StoreRequest extends FormRequest
+{
+    public function authorize(): bool { return true; }
+
+    public function rules(): array
+    {
+        return [
+            'code'        => 'required|string|max:100',
+            'name'        => 'required|string|max:200',
+            'category_id' => 'nullable|integer',
+            'lifecycle'   => 'nullable|string|max:50',
+            'description' => 'nullable|string',
+            'is_active'   => 'boolean',
+        ];
+    }
+
+    public function messages(): array
+    {
+        return [
+            'code.required' => __('validation.required', ['attribute' => '모델코드']),
+            'name.required' => __('validation.required', ['attribute' => '모델명']),
+        ];
+    }
+
+    protected function prepareForValidation(): void
+    {
+        if ($this->has('code')) {
+            $this->merge(['code' => trim($this->input('code'))]);
+        }
+    }
+}
diff --git a/app/Http/Requests/Design/Model/UpdateRequest.php b/app/Http/Requests/Design/Model/UpdateRequest.php
new file mode 100644
index 0000000..f9b403b
--- /dev/null
+++ b/app/Http/Requests/Design/Model/UpdateRequest.php
@@ -0,0 +1,25 @@
+<?php
+
+namespace App\Http\Requests\Design\Model;
+
+use Illuminate\Foundation\Http\FormRequest;
+
+class UpdateRequest extends FormRequest
+{
+    public function authorize(): bool
+    {
+        return true;
+    }
+
+    public function rules(): array
+    {
+        return [
+            'code' => 'sometimes|string|max:100',
+            'name' => 'sometimes|string|max:200',
+            'category_id' => 'nullable|integer',
+            'lifecycle' => 'nullable|string|max:50',
+            'description' => 'nullable|string',
+            'is_active' => 'boolean',
+        ];
+    }
+}
diff --git a/app/Http/Requests/Design/ModelVersion/CreateDraftRequest.php b/app/Http/Requests/Design/ModelVersion/CreateDraftRequest.php
new file mode 100644
index 0000000..c345b57
--- /dev/null
+++ b/app/Http/Requests/Design/ModelVersion/CreateDraftRequest.php
@@ -0,0 +1,30 @@
+<?php
+
+namespace App\Http\Requests\Design\ModelVersion;
+
+use Illuminate\Foundation\Http\FormRequest;
+
+class CreateDraftRequest extends FormRequest
+{
+    public function authorize(): bool
+    {
+        return true;
+    }
+
+    public function rules(): array
+    {
+        return [
+            'version_no' => 'nullable|integer|min:1',
+            'notes' => 'nullable|string',
+            'effective_from' => 'nullable|date',
+            'effective_to' => 'nullable|date|after_or_equal:effective_from',
+        ];
+    }
+
+    public function messages(): array
+    {
+        return [
+            'effective_to.after_or_equal' => __('validation.after_or_equal', ['attribute' => 'effective_to', 'date' => 'effective_from']),
+        ];
+    }
+}
diff --git a/app/Support/Validation/BomItemRules.php b/app/Support/Validation/BomItemRules.php
new file mode 100644
index 0000000..42d31d3
--- /dev/null
+++ b/app/Support/Validation/BomItemRules.php
@@ -0,0 +1,19 @@
+<?php
+namespace App\Support\Validation;
+
+class BomItemRules
+{
+    public static function base(): array
+    {
+        return [
+            'ref_type'   => 'required|string|in:MATERIAL,PRODUCT',
+            'ref_id'     => 'required|integer|min:1',
+            'qty'        => 'required|numeric|gt:0',
+            'waste_rate' => 'nullable|numeric|min:0',
+            'uom_id'     => 'nullable|integer|min:1',
+            'notes'      => 'nullable|string|max:255',
+            'sort_order' => 'nullable|integer',
+            'category_id'=> 'nullable|integer', // 선택: 카테고리 분류 사용 시
+        ];
+    }
+}
diff --git a/storage/api-docs/api-docs.json b/storage/api-docs/api-docs.json
old mode 100644
new mode 100755