I agree that the 996 is too much 928.
Still I would not go for a TVR as Porsche substitute. I'd rather have a BMW M3 then. Or if I could afford it modify a 996 to look and sound more aircooled. It can be done - IF you have the money.
Actually most of those who bother to comment on my Carrera 3.2 are impressed by the interior. Those 5 round instruments have some kind of exotic wow-aura that intimidates people. Heck they even make me feel important when I sit behind them
I agree on the parts sharing being bad for exotic cars. Still look at Ferrari. They've been using Fiat parts in many of their cars.