VERY decent ideas. the body is pretty flimsy though, I think if I flip it at say 10-15mph and it lands upside down, the damage is likely to be pretty high, cracked pits, body posts smashed through etc.. The mount subframe would have to be thinwall steel or aluminum. Hmmm.... very interesting.
In the back of my mind, and for whatever unknown reason... I really want to see 4 body posts and the shell, just be a shell, with no subframe on it. Maybe it doesn't have to come straight up off the frame.