Here I have the outer perimeter tacked together and bolted to the bedsides and front panel. I have two bolts up front and three down each side. Here the bedstrips are laid in place for the positioning of the two center braces that will be tacked in. They are located where the stock ones bolted to the bed wood and to the frame. This way the bedstrip bolts will all line up with the crossmembers and bolt to them.