This is really ghey.
To get a sheet of aluminum the size I need, the metal alone is going to cost me $180+ and if I screw it up, too bad (sorta).
To get a thinner sheet of stainless steel (heavier, but stronger), I would go with like a 12ga (1/10") sheet.....~$300
Anyone have any other ideas? Otherwise, if the price is right, Buschur is selling a pre-cut, pre-measured undertray for $175+shipping, no muss no fuss.