Just develop a midsize RWD drivetrain and put a new retro/hot Rod body on it. Lets say start with a 57 chevy body shell. Offer 50,000 copys a year for two years then put a new shell on it. Make it a contest/vote on which classic GM body you should put together next, again offer only 100,000 over two years. Dont change the basic stucture of this vehicle because most classic cars are 2 door coupe/sedan/pickups. This concept could probably last 20 years (10 good classic reproductions). The japanese would not have an answer to this because they haven't got the past to play on.