How big is the design? If you are prototyping something, we could cut it on a laser in 3mm wood just to see if it works first. Most home shop lasers are going to struggle to cut steel or aluminum. This could even be cardboard depending on your prototyping goals.
If it will fit on my laser cutter and you've got a design I'd be happy to try to help (but I can't do metal).
Cheers!
-Doug