diff --git a/src/Orchard.Tests/Models/DefaultModelBuilderTests.cs b/src/Orchard.Tests/Models/DefaultModelManagerTests.cs
similarity index 96%
rename from src/Orchard.Tests/Models/DefaultModelBuilderTests.cs
rename to src/Orchard.Tests/Models/DefaultModelManagerTests.cs
index ed74324c9..667b659b2 100644
--- a/src/Orchard.Tests/Models/DefaultModelBuilderTests.cs
+++ b/src/Orchard.Tests/Models/DefaultModelManagerTests.cs
@@ -12,7 +12,7 @@ using Orchard.Tests.Models.Stubs;
 
 namespace Orchard.Tests.Models {
     [TestFixture]
-    public class DefaultModelBuilderTests {
+    public class DefaultModelManagerTests {
         private IContainer _container;
         private IModelManager _manager;
         private ISessionFactory _sessionFactory;
diff --git a/src/Orchard.Tests/Models/Drivers/ModelBuilderTests.cs b/src/Orchard.Tests/Models/Drivers/ModelBuilderTests.cs
new file mode 100644
index 000000000..25ad63a24
--- /dev/null
+++ b/src/Orchard.Tests/Models/Drivers/ModelBuilderTests.cs
@@ -0,0 +1,39 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using NUnit.Framework;
+using Orchard.Models.Driver;
+using Orchard.Tests.Models.Stubs;
+
+namespace Orchard.Tests.Models.Drivers {
+    [TestFixture]
+    public class ModelBuilderTests {
+        [Test]
+        public void BuilderShouldReturnWorkingModelWithTypeAndId() {
+            var builder = new ModelBuilder("foo");
+            var model = builder.Build();
+            Assert.That(model.ModelType, Is.EqualTo("foo"));
+        }
+
+        [Test]
+        public void IdShouldDefaultToZero() {
+            var builder = new ModelBuilder("foo");
+            var model = builder.Build();
+            Assert.That(model.Id, Is.EqualTo(0));
+        }
+
+        [Test]
+        public void WeldShouldAddPartToModel() {
+            var builder = new ModelBuilder("foo");
+            builder.Weld<Alpha>();
+            var model = builder.Build();
+
+            Assert.That(model.Is<Alpha>(), Is.True);
+            Assert.That(model.As<Alpha>(), Is.Not.Null);
+            Assert.That(model.Is<Beta>(), Is.False);
+            Assert.That(model.As<Beta>(), Is.Null);
+        }
+    }
+}
+
diff --git a/src/Orchard.Tests/Models/Stubs/AlphaDriver.cs b/src/Orchard.Tests/Models/Stubs/AlphaDriver.cs
index b9911bd3e..ccd221fce 100644
--- a/src/Orchard.Tests/Models/Stubs/AlphaDriver.cs
+++ b/src/Orchard.Tests/Models/Stubs/AlphaDriver.cs
@@ -4,7 +4,7 @@ namespace Orchard.Tests.Models.Stubs {
     public class AlphaDriver : ModelDriver {
         protected override void New(NewModelContext context) {
             if (context.ModelType == "alpha") {
-                WeldModelPart<Alpha>(context);
+                context.Builder.Weld<Alpha>();
             }
         }
     }
diff --git a/src/Orchard.Tests/Models/Stubs/BetaDriver.cs b/src/Orchard.Tests/Models/Stubs/BetaDriver.cs
index d872aed16..b97208552 100644
--- a/src/Orchard.Tests/Models/Stubs/BetaDriver.cs
+++ b/src/Orchard.Tests/Models/Stubs/BetaDriver.cs
@@ -8,7 +8,7 @@ namespace Orchard.Tests.Models.Stubs {
     public class BetaDriver : ModelDriver {
         protected override void New(NewModelContext context) {
             if (context.ModelType == "beta") {
-                WeldModelPart<Beta>(context);
+                context.Builder.Weld<Beta>();
             }
         }
     }
diff --git a/src/Orchard.Tests/Models/Stubs/FlavoredDriver.cs b/src/Orchard.Tests/Models/Stubs/FlavoredDriver.cs
index 8acaa662a..15b77f159 100644
--- a/src/Orchard.Tests/Models/Stubs/FlavoredDriver.cs
+++ b/src/Orchard.Tests/Models/Stubs/FlavoredDriver.cs
@@ -4,7 +4,7 @@ namespace Orchard.Tests.Models.Stubs {
     public class FlavoredDriver : ModelDriver {
         protected override void New(NewModelContext context) {
             if (context.ModelType == "beta" || context.ModelType == "alpha") {
-                WeldModelPart<Flavored>(context);
+                context.Builder.Weld<Flavored>();
             }
         }
     }
diff --git a/src/Orchard.Tests/Models/Stubs/Gamma.cs b/src/Orchard.Tests/Models/Stubs/Gamma.cs
index dd8187a2c..8a0a71c80 100644
--- a/src/Orchard.Tests/Models/Stubs/Gamma.cs
+++ b/src/Orchard.Tests/Models/Stubs/Gamma.cs
@@ -22,7 +22,7 @@ namespace Orchard.Tests.Models.Stubs {
 
         protected override void New(NewModelContext context) {
             if (context.ModelType == "gamma") {
-                WeldModelPart<Gamma>(context);
+                context.Builder.Weld<Gamma>();
             }
         }
     }
diff --git a/src/Orchard.Tests/Models/Stubs/StyledDriver.cs b/src/Orchard.Tests/Models/Stubs/StyledDriver.cs
index 2ce06faba..9eae01c66 100644
--- a/src/Orchard.Tests/Models/Stubs/StyledDriver.cs
+++ b/src/Orchard.Tests/Models/Stubs/StyledDriver.cs
@@ -4,7 +4,7 @@ namespace Orchard.Tests.Models.Stubs {
     public class StyledDriver : ModelDriver {
         protected override void New(NewModelContext context) {
             if (context.ModelType == "alpha") {
-                WeldModelPart<Styled>(context);
+                context.Builder.Weld<Styled>();
             }
         }
     }
diff --git a/src/Orchard.Tests/Orchard.Tests.csproj b/src/Orchard.Tests/Orchard.Tests.csproj
index 3f1837187..98206bf97 100644
--- a/src/Orchard.Tests/Orchard.Tests.csproj
+++ b/src/Orchard.Tests/Orchard.Tests.csproj
@@ -105,7 +105,8 @@
     <Compile Include="Environment\OrchardStarterTests.cs" />
     <Compile Include="Localization\NullLocalizerTests.cs" />
     <Compile Include="Logging\LoggingModuleTests.cs" />
-    <Compile Include="Models\DefaultModelBuilderTests.cs" />
+    <Compile Include="Models\DefaultModelManagerTests.cs" />
+    <Compile Include="Models\Drivers\ModelBuilderTests.cs" />
     <Compile Include="Models\Stubs\Alpha.cs" />
     <Compile Include="Models\Stubs\AlphaDriver.cs" />
     <Compile Include="Models\Stubs\Beta.cs" />
diff --git a/src/Orchard.Web/Packages/Orchard.Roles/Models/UserRolesDriver.cs b/src/Orchard.Web/Packages/Orchard.Roles/Models/UserRolesDriver.cs
index b4cc3a031..f2f80e521 100644
--- a/src/Orchard.Web/Packages/Orchard.Roles/Models/UserRolesDriver.cs
+++ b/src/Orchard.Web/Packages/Orchard.Roles/Models/UserRolesDriver.cs
@@ -23,7 +23,7 @@ namespace Orchard.Roles.Models {
 
         protected override void New(NewModelContext context) {
             if (context.ModelType == "user") {
-                WeldModelPart<UserRolesModel>(context);
+                context.Builder.Weld<UserRolesModel>();
             }
         }
 
diff --git a/src/Orchard.Web/Packages/Orchard.Users/Models/UserDriver.cs b/src/Orchard.Web/Packages/Orchard.Users/Models/UserDriver.cs
index ea7404313..49fc04958 100644
--- a/src/Orchard.Web/Packages/Orchard.Users/Models/UserDriver.cs
+++ b/src/Orchard.Web/Packages/Orchard.Users/Models/UserDriver.cs
@@ -3,12 +3,13 @@ using Orchard.Models.Driver;
 
 namespace Orchard.Users.Models {
     public class UserDriver : ModelDriverWithRecord<UserRecord> {
-        public UserDriver(IRepository<UserRecord> repository) : base(repository) {
+        public UserDriver(IRepository<UserRecord> repository)
+            : base(repository) {
         }
 
         protected override void New(NewModelContext context) {
             if (context.ModelType == "user") {
-                WeldModelPart<UserModel>(context);
+                context.Builder.Weld<UserModel>();
             }
         }
     }
diff --git a/src/Orchard/Models/DefaultModelManager.cs b/src/Orchard/Models/DefaultModelManager.cs
index e62cb6b08..9fcd7d8a9 100644
--- a/src/Orchard/Models/DefaultModelManager.cs
+++ b/src/Orchard/Models/DefaultModelManager.cs
@@ -26,7 +26,7 @@ namespace Orchard.Models {
             // create a new kernel for the model instance
             var context = new NewModelContext {
                 ModelType = modelType,
-                Instance = new ModelRoot(modelType)
+                Builder = new ModelBuilder(modelType)
             };
 
             // invoke drivers to weld aspects onto kernel
@@ -35,7 +35,7 @@ namespace Orchard.Models {
             }
 
             // composite result is returned
-            return context.Instance;
+            return context.Builder.Build();
         }
 
         public virtual IModel Get(int id) {
diff --git a/src/Orchard/Models/Driver/ModelBuilder.cs b/src/Orchard/Models/Driver/ModelBuilder.cs
new file mode 100644
index 000000000..add9c3b1c
--- /dev/null
+++ b/src/Orchard/Models/Driver/ModelBuilder.cs
@@ -0,0 +1,22 @@
+using System;
+
+namespace Orchard.Models.Driver {
+    public class ModelBuilder {
+        private IModel _instance;
+
+        public ModelBuilder(string modelType) {
+            _instance = new ModelRoot(modelType);
+        }
+
+        public IModel Build() {
+            return _instance;
+        }
+
+        public ModelBuilder Weld<TPart>() where TPart : class, IModel, new() {
+            var part = new TPart();
+            part.Weld(_instance);
+            _instance = part;
+            return this;
+        }
+    }
+}
diff --git a/src/Orchard/Models/Driver/ModelDriver.cs b/src/Orchard/Models/Driver/ModelDriver.cs
index 3bba22106..f34592e91 100644
--- a/src/Orchard/Models/Driver/ModelDriver.cs
+++ b/src/Orchard/Models/Driver/ModelDriver.cs
@@ -29,17 +29,5 @@ namespace Orchard.Models.Driver {
 
         protected virtual void UpdateEditors(UpdateModelContext context) {
         }
-
-        /// <summary>
-        /// TODO: move this - make a modelbuilder class or something
-        /// </summary>
-        /// <typeparam name="TPart"></typeparam>
-        /// <param name="context"></param>
-        protected void WeldModelPart<TPart>(NewModelContext context) where TPart : class,IModel,new() {
-            var newPart = new TPart();
-            newPart.Weld(context.Instance);
-            context.Instance = newPart;
-        }
-
     }
 }
\ No newline at end of file
diff --git a/src/Orchard/Models/Driver/NewModelContext.cs b/src/Orchard/Models/Driver/NewModelContext.cs
index cdf1fda30..4226e046d 100644
--- a/src/Orchard/Models/Driver/NewModelContext.cs
+++ b/src/Orchard/Models/Driver/NewModelContext.cs
@@ -1,6 +1,6 @@
 namespace Orchard.Models.Driver {
     public class NewModelContext {
         public string ModelType { get; set; }
-        public IModel Instance { get; set; }
+        public ModelBuilder Builder { get; set; }
     }
 }
diff --git a/src/Orchard/Orchard.csproj b/src/Orchard/Orchard.csproj
index 1dcebfdee..173fb5f1d 100644
--- a/src/Orchard/Orchard.csproj
+++ b/src/Orchard/Orchard.csproj
@@ -137,6 +137,7 @@
     <Compile Include="Models\DefaultModelManager.cs" />
     <Compile Include="Models\Driver\CreateModelContext.cs" />
     <Compile Include="Models\Driver\LoadModelContext.cs" />
+    <Compile Include="Models\Driver\ModelBuilder.cs" />
     <Compile Include="Models\Driver\ModelDriver.cs" />
     <Compile Include="Models\Driver\ModelDriverWithRecord.cs" />
     <Compile Include="Models\Driver\NewModelContext.cs" />