I own and operate a tube guitar amp construction business. I've been importing aluminum tube guitar amp chassis because I can't locate anyone here in oklahoma city that can build them for me. The attached jpg's show the actual chassis and the layout of the chassis in a line drawing. I can provide all actual punch / drill measurements to anyone who can build themn for me. Overall dimensions are 17 L x 6.5 W x 2.5" H, 18.25" wide with mounting tabs. Please help me stop outsourcing this work, I know it can be done in the good ol'e USA! I'm looking for 10, 20, 50 pieces initially based on cost.