Thanks!
Actually, I'm not going to make a Billy doll because a) I don't know how...and b)I don't think it would actually look like him and c) I don't have time (this is the real answer). I just bought a bunch of vent dummies on ebay, so I will have a wall of dolls kind of like the one in the move.
That is my next project. I'll post pictures when it's done.