More 1.12 shenanigans. Still far from done.

src/main/java/appeng/bootstrap/IBootstrapComponent.java

@@ -32,7 +32,7 @@ public interface IBootstrapComponent
 	{
 	}
 
-	default void modelLoader( Side side )
+	default void modelReg( Side side )
 	{
 	}
 

src/main/java/appeng/bootstrap/ItemDefinitionBuilder.java

@@ -31,8 +31,6 @@ import net.minecraft.block.BlockDispenser;
 import net.minecraft.creativetab.CreativeTabs;
 import net.minecraft.dispenser.IBehaviorDispenseItem;
 import net.minecraft.item.Item;
-import net.minecraftforge.fml.common.registry.ForgeRegistries;
-import net.minecraftforge.fml.common.registry.GameRegistry;
 import net.minecraftforge.fml.relauncher.Side;
 import net.minecraftforge.fml.relauncher.SideOnly;
 
@@ -59,6 +57,8 @@ class ItemDefinitionBuilder implements IItemBuilder
 
 	private final List<Consumer<Item>> initCallbacks = new ArrayList<>();
 
+	private final List<Consumer<Item>> modelRegCallbacks = new ArrayList<>();
+
 	private final List<Consumer<Item>> postInitCallbacks = new ArrayList<>();
 
 	private Supplier<IBehaviorDispenseItem> dispenserBehaviorSupplier;
@@ -165,6 +165,7 @@ class ItemDefinitionBuilder implements IItemBuilder
 		// Register all extra handlers
 		preInitCallbacks.forEach( consumer -> factory.addPreInit( side -> consumer.accept( item ) ) );
 		initCallbacks.forEach( consumer -> factory.addInit( side -> consumer.accept( item ) ) );
+		modelRegCallbacks.forEach(consumer -> factory.addModelReg(side -> consumer.accept( item ) ) );
 		postInitCallbacks.forEach( consumer -> factory.addPostInit( side -> consumer.accept( item ) ) );
 
 		// Register custom dispenser behavior if requested

src/main/java/appeng/bootstrap/components/ModelOverrideComponent.java

@@ -30,6 +30,8 @@ import net.minecraft.client.renderer.block.model.IBakedModel;
 import net.minecraft.client.renderer.block.model.ModelResourceLocation;
 import net.minecraft.util.registry.IRegistry;
 import net.minecraftforge.client.event.ModelBakeEvent;
+import net.minecraftforge.client.model.IModel;
+import net.minecraftforge.client.model.ModelLoaderRegistry;
 import net.minecraftforge.common.MinecraftForge;
 import net.minecraftforge.fml.common.eventhandler.SubscribeEvent;
 import net.minecraftforge.fml.relauncher.Side;
@@ -61,7 +63,8 @@ public class ModelOverrideComponent implements PreInitComponent
 	{
 		IRegistry<ModelResourceLocation, IBakedModel> modelRegistry = event.getModelRegistry();
 		Set<ModelResourceLocation> keys = Sets.newHashSet( modelRegistry.getKeys() );
-		IBakedModel missingModel = modelRegistry.getObject( MODEL_MISSING );
+//		IBakedModel missingModel = modelRegistry.getObject( MODEL_MISSING );
+		IModel missingModel = ModelLoaderRegistry.getMissingModel();
 
 		for( ModelResourceLocation location : keys )
 		{

src/main/java/appeng/bootstrap/components/TesrComponent.java

@@ -31,6 +31,7 @@ import appeng.tile.AEBaseTile;
  *
  * @param <T>
  */
+//public class TesrComponent<T extends AEBaseTile> implements ModelRegComponent
 public class TesrComponent<T extends AEBaseTile> implements PreInitComponent
 {
 
@@ -45,6 +46,7 @@ public class TesrComponent<T extends AEBaseTile> implements PreInitComponent
 	}
 
 	@Override
+//	public void modelReg( Side side )
 	public void preInitialize( Side side )
 	{
 		ClientRegistry.bindTileEntitySpecialRenderer( tileEntityClass, tesr );