Check out our range of free trailer plans an building instructions. easy to read and understand drawings, sketches and tips to help you build your own trailer, step. 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. Free motorboat plans for the backyard home builder, build your own speed boat, cabin cruiser, runabout or utility boat using these simple plywood designs..