Is it a particular size you are looking for or a standard size (Marshall / Fender) and just your decisions on hole placement? I usually get a blank chassis and do the hole punching myself using actual hole punches.
This is an amp I'm currently building that started as a complete blank chassis (no holes). I did all the hole punching myself and had BNP Lasers make the faceplates from a layout I did in Corel Draw. I powdercoated the outside of the chassis also - I have the equipment to do smaller parts. Sorry for the big pictures - I had no way to resize them here at work...
You may find some guys that will custom make a one off / punched chassis for you, but it's gonna cost you... You're better off buying the 4 or 5 punch sizes you need and picking up a blank chassis for 30 bucks.
If you can work with a standard size pre-bent blank chassis, I can do all the holes to your spec for 35 bucks. Just PM me if you're interested