I then made the surrounding box for the dartboard. This was pretty simple. I laser cut the back piece to be exactly 22x22 inches. I then attached 2x4 planks to the sides for stability. They were the perfect width to allow the dartboard to fit nicely inside. You can't see in this photo, but the dartboard is mounted to a U shaped bracket that a screw on the back of the dartboard sits nicely in.