Though it's not part of the Super X installation, I thought I'd show how I finished off the rear of the main 'rails. A stock Model A chassis uses a pair of triangular plates riveted to the 'rails and rear crossmember where they join. I could have just boxed these in with 1/8-inch plate but wanted to retain the stock appearance as much as possible, as this area will be seen on the finished car. The lower plate is larger than the upper, so I bent up a filler piece that was butt welded to the edge of the upper, but was welded slightly inboard on the lower. I also retained the stock rivets. Boxing this area in this way will provide extra strength without making it look like a triangular piece of box section was welded into the corner!