Waves or no waves, a stand-up paddleboard will let you walk on water. at a surfboard-makers supply store, i bought a $228 sup blank�a 10-foot 4-inch rectangular slab of expanded polystyrene (eps. We took advantage of the growing popularity of stand up paddle boards and developed a set of plans that are easy to build: the paddle board 14-32. the hull bottom is flat for stability and minimal draft. the hull has minimal rocker to improve straight tracking.. Stand up paddle board plan photo find this pin and more on