Easy Diy Puzzle Board . Start slightly undersized and creep up on the fit widening the slot in small increments, testing in between each cut. Try to find one with a lot of color and one that isn't too monochromatic or uniform, otherwise it might be too hard to complete. 4 Drawer Puzzle Board by Kram79 woodworking community from lumberjocks.com Cut end of the trim at a 45 degree angle. Then lay the trim along the edge of the board and mark it for length. 6.35 inches by 9.5 inches.