MOTM

I am no panel expert nor am I machine fabrication expert but I think you can
design and computer cut your own panels out of all sorts of materials from
this place online:

http://www.emachineshop.com/

Not sure how much it would cost and the painting and stuff would have to be
done somewhere else but for one off prototypes might be useful....at least I
think. A panel expert would have to check it out.

I am about to use them to fabricate some custom gearing for a side project
soon so I may have some experience in the future. The CAD software appears
pretty easy to use.  Wired reviewed them a while back, they got a good
review.
Regards,
Don Relyea
http://www.donrelyea.com