I have considered that option as well, and it might be an option. However, im very limited in my driving range - anxiety, stress, pain from potholes, etc - so I can't exactly drive very far to reach these places.Bring your files to a sheet metal shop. There they have sheets, they have lasers, brakes, everything you need to make a case. You will pay, but that is how it is with made to order.
I'm on the island on Montreal BTW, so if you do know of such a metal shop nearby -ish, let me know. I know of only one that's close by, but they dont really accept walk-in PC enthusiasts from the street as customers haha. Besides which, I think they only do stamping and bending, nothing complex or small enough to be suitable for a PC case (but I'll double-check to be certain).