I may do this but don't make me promise. Buy a 4x8 feet Extruded polystyrene foam board 1 1/2 to 2 inches thick and cut it in half for a 4x4 square and taper the sides at a 45 degree angle. Then add black dye to the resin and hardener and lay one layer of fiberglass to the foam board. The black fiberglass will be warm as turtles like bask on. Double fiberglass a portion of one end for a rope and anchor to fasten through.
