Ok, I've been fiddling around and came to a conclusion... It won't be easy.
One thing you could do is ask sactuary what he did, he's a nice guy so he won't shoot you down.
Another thing you could do is look at the .cpp files of the Graa thing I sent you, and look at what goes down in there, to my understanding (which isn't much) The model defs should be in there, maybe he have to dig for a while.
This is kinda outta my league, so I'd say wait for someone with experience to help you... Unless you can't wait that long.