Using one of these boat plans, you will be able to build the boat you have dreamed of for years. these boat plans come in many variations and there are powerboats. Learn how to build a plywood boat. you can make a great boat out of one sheet of plywood. watch our video here and see how we build a boat.. Free plans for the ganymede. i decided that i wanted to get more people addicted to kayak building, so like any good drug pusher, i’m going to give away the plans for.