Wow. That collar attaching method is awesome. As someone who has a miniscule amount of experience in that kind of thing. What did you use and how did you make it so I could give it a go?
I had considered doing something similar, but just a shoulders up display PP3--along the lines of what the Sideshow bust should have been but wasn't . . .
I needed construct that myself. Its very easy to make. just get an aluminim flat bar, then drill some holes at the screws through it and jb weld it. thats what i did.