I'm sure somebody's already done a thread about this before, but I was wondering, how can I convert a 2-door car model kit into a 4-door? The specific vehicle I'm looking to do is the MPC 1972 Pontiac GTO as a LeMans sedan, but I'll take any general advice I can get. If anybody knows of anybody that does a LeMans sedan resin kit, I'll gladly take that info as well.