[lunarhighway]

perhaps for windows you could look into a one part aircraft type cupolas. these are manifactured by vacuum forming plastic over a mold. it will still be expensive but i imagine it would cost less than individual windows, wich might still be interesting to have to prevent heating, but i imagine they could be masked off and the rest be painted (also the paint could be semi transparent). a single piece would also eliminate inevitable seems and be lighter than a multy part system. given the rear slope a transparent rear roof might be more usefull than the two rear windows perhaps similar smaller parts could be used in the nose cone. alowing for simpler cheaper lights to be installed without any interruptions in the shape.

the car would than need some sort of roll cage to be safe but this could from internal window pillars and be used as an attachement point for the cuppola and the interior trim

anyway just an idea