I finally made another ply board, using the last piece out of my douglas fir 1/2 inch plywood. This one is a skimboard, to add the rocker I piled 200 pounds weight in the middle for 2 days which gave it a nice 2 inch rocker, polyurethane spar varnish finish, contact cement welding a pinkish yoga mat to the top. The yoga mat turned out to be very comfortable. 45.7 cm x 140 cm.

Unfortunately I thought that yoga mat was more red but it definitely looks pinkish, making it look a bit like a giant darvocet.