Narrowboat & widebeam diy design plans if you’re looking to design a narrowboat or widebeam layout, drawing to scale and at a size that’s usable is invaluable. whether you are buying a fully fitted boat from a boat builder, buying a sailaway to fit out yourself or even re-fitting a canal boat, our fully customisable canal boat plans will. Specmar catamaran hulls are either symmetrical or asymmetrical in design. a symmetrical hull consists of two basic v-bottom hull structures. asymmetrical hulls are basically a monohaul craft split down the middle and spread apart... Canoe, kayak, and other boat plans for the amateur boat builder.. below are free plans from the web for building a plywood boat. over 40 free plans. boating is full of thrill and adventures, and you will be glad to make it a part of your camp plans...