Simple project with 2 pcs of 1x6 @ 20"
I riped them down to 8 pcs @ 1 1/2" pcs and used dado blades to cut out so that half of them would cap one side of. Once capped, I cut them at 45 degrees to the size of the puzzle. I used mode podge to glue the puzzle together. I cut a scrap pc of 1/8" mdf to 1/2" over the size of the puzzle. I then router ed a slot for the puzzle and mdf to slide into, glue and a few staples...... all done!