Free sailboat plans. a selection of some of the free sailboat plans (pdf) that were published in magazines such as “popular mechanics”, "popular science" and the "boat builder handbook".. Boat plans from science and mechanics and boat builder handbooks. plans for hydroplanes, sailboats, inboards, runabouts, canoes, kayaks and many other boats. this is a free user supported site.. – the 12ft ella skiff – get the plans for this easy to build lightweight rowing boat here. 12ft ella skiff – the sailing version of the ella skiff – get the plans here (now in version 1.2)..