Free boat plans for the backyard home builder, plywood canoes are not easy to build, but here is one free boat plan that can be made of ordinary materials for. Free boat plans from "science and mechanics", links to other sites with free boat plans. free boat design resources; www.absolutelyfreeplans.com;. Boat plans catalog – 300 boats you can build! home. about our plans & kits; one response to boat plans catalog – 300 boats you can build!.