I had a chassis and faceplate made by these guys. They did a great job and the price was quite reasonable. I designed the faceplate on a CAD system, and they used their CAD reader. They may be able to do it from any computer file that you can specify the dimensions on accurately. They silkscreened the lettering and all.
http://www.par-metal.com/
http://www.par-metal.com/