Funny, but the most unique part of the Spider is it's interior, and possibly the most disired part Wedgies want for their cars ...I know mine would look sweet with the black/grey inserts !!!
So on that note, it would almost be a sacrilege to modify your interior , but without proper replacements ...like you mentioned ...what other choice is there eh ??
I think the red seats and door card inserts work really well in the car, I could live with the steering wheel and shifter boot, but I'm less excited about the knee pads and console lid. If you've ever seen a 05-06 Mustang with the black and red interior trim, you should have a pretty good idea of what your car would look like in real world ....
The only bad thing I could think is (speaking from experience in once owning a car with a red int) is that depending on the hue, sometimes too much red can play havoc on your mood, on some of those rough mornings /ubbthreads/images/graemlins/wink.gif
Btw , that being said, I voted "amazing, I want that"