using rotateProp on doorway

[The chaser]

Hey, that's a quite interesting effect!

Anyway: I've seen in the model editor that you have lots of bodies. Those bodies are just shapes that aren't added to any mesh, except Body2, which has all the model.

You can do complicated shapes and then make them fusioned:

Shape, shape, shape, select 'em all: Create body. In Outline, put the mesh in the body. Done!