[WarrenG]

If bare naked polished is "illegal," how about just a clear coat over the aluminum? That way you could say that it was "painted." Would that get an effect similar to bare polished?

As for painted outside and aluminum inside, there are several fiberglass cars out there in various colors that have at least the underside of the hood "plated" in aluminum. It looks pretty good in pictures. I would think original aluminum would would turn out at least as good looking.