Iain McKenzie sold me some sheet steel (can't remember what gauge; 19 possibly) and as soon as I got home I set about fabricating a replacement cab floor support to replace my badly rusted one. Initially the joints were done with pop rivets...and these were later done properly with a MIG welder, once I had one. All the bends were done manually, using angle iron clamped on either side of the sheet to provide shape...hammered over. It doesn't matter that the finish is course because it will be covered by the floor. I only need to weld in captive nuts to finish the piece.