This asset has been created with a simple mechanism to ensure its effectiveness in generating a large number of difference models quickly in a scene build.

If you have the 3Dmodel asset on hand, you can try automatic generation immediately.

Register the information of the prefabs arranged in the scene in ScriptableObject and use this as a parts list,
Combine parts randomly and rearrange them in the scene.
By using the Material Random Changer component and editor bundled with this asset together, a large number of difference models can be arranged in a scene in an instant.

Sample WebGL