Boat plans for the 40 this boat is easy to build using our downloadable boat plans. our boat plans are available for instant download so you can start building. 1 sheet + is an attempt to make a nice looking, good performing small boat out of a single sheet of plywood. with a 30" beam and a length of 88", the boat achieves 4. Learn how to build yourself a boat in your backyard. our complete boat plans collection is available for free and immediate download. it is the largest wood boat.