The boards are BetterBoards, and the outer edge traction piece, is just stock, and powder coated...however, when I took them off, I got some 3/8th inch (square) cold rolled steel, and then shaved it to fit inside the edge piece, and that REALLY stiffened up the boards...
the rear bumper/tunnel mod is a kit made by Skinz, and it is VERY VERY strong and saved my tunnel when the sled took an accidental tumble, unfortunately crushed the bumper, but SAVED the tunnel, and have a new kit installed, but no new pics yet, will post some later, as I went without the powdercoated version to see how it looks...