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I've done four 13 ft Sports, 1972, 1978, 1981, and 1988 and the side pieces were all made of the same mahogany as the seats, 5/4 thickness. The anchor hatch is 3/4" thick plywood and I use mahogany edge tape to finish off all edges. Comes out great. BTW, you can get a 2ft x 4ft 3/4" mahogany plywood piece sent to your home from Home Depot for a good price and the quality is pretty good.