The only thing I know is the bodies were fitted and ready for paint prior. The guys were sworn to secrecy and they are being pretty good about not telling. I havn't even seen so much as leaked spy shot. One of the requirements was that you had built a FFR previously, hot rod or not. Some have built multiple FFR hot rods already so I think they might surprise you.
Builting one of these is prety straight forward if you keep it simple. My guess is they will be pretty basic with no fancy extras, but they will run and drive fine and look good.