I started this frame by making the basic frame from angle iron, welded together at the corners. I then went around the frame with aluminum, and again with copper. The copper started out as pipe, which I slit, hammered flat, cut to my desired shape, and soldered together. I then laid these aluminum and copper sections over the steel, and drilled and tapped 72, 1/8 inch holes around the frame, and installed socket head cap screws to hold all the layers together. I then went over the whole frame with a wire wheel and scotch pads.