Free motorboat plans for the backyard home builder, build your own speed boat, cabin cruiser, runabout or utility boat using these simple plywood designs.. Links to boat plans some free boat plans, boat building information including plywood stitch and glue. full range of boat plans from sophisticated yachts to plywood. Learn how to build yourself an inboard or outboard boat in your backyard. our complete boat plans collection is available for free and immediate download. it is the.