Peter,
Interesting about no polished aluminum allowed. You mentioned having to 'adapt' the Cobra to be compliant with Swiss law. Just curious, but what exactly does that involve?
For paint on the outside and bare aluminum on the inside, I'll bet that someone here can come up with some photos of such a set up ... the tough part may be selecting a color.
Take a look though the Gallery, might be something there of interest.
If you wind up purchasing a pre owned brushed aluminum car, one thought would be to live with it in it's BNL state and see what you think after a while. You might decide to leave it bare.
If you are considering having a car built, then getting it painted during the build process is the way to go ... less work in the long run.
- Tim