“$7 custom surfboard (old school)” must be a bit of b.s. on the cost but still cheap. Home Depot has 1" X 12" X 6’ pine for about $8.50 and Douglas Fir 2X4’s for $2 plus some epoxy for glue up. Could do Dale Solomonsons suggested parafin/heatgun seal and be done for under $20 is you went w/ the 2X4’s The quick and dirty method I guess