I found the piece of shelving in my shop and couldnt remember what it went to, so it goes to this project. It was a piece of particle board covered in paper that looked like wood grain. This was from some sort of ultra cheap furniture, no big loss if I figure out where it goes. I used a drywall square and pen to layout a 1"x1" grid on the board allowing some room on the two edges for clamps, should I need to clamp t to something. Honestly I just layed out the grid until the square wouldnt fit then called the undone section "clamp space."