Don't know if these guys have been brought up before, but I came across them in one of my Mustang mags and thought of some of us here on PFF:
www.midwestcomposite.com Their subsidiary,
www.midwestautogear.com looks to be pretty much a Mustang site, but it gives you good pictures of the stuff they can do-plus, there's no reason they cannot expand to offer GM and other products as well.
Their ad points out that they do design, prototypes, tooling and short run production all under one roof. Plus, 1-2 day Rapid Prototype Parts out of metal and plastics to customers world wide. They've got some super-duper-whammidyne Plastic Sintering Machine that does all kinds of cool stuff.
Anyway, just thought I'd throw that out there for all you creative types. I've thought about a few things that would be cool to have them do, but my time is spoken for by more pressing matters right now.
Ryan