Dragonfly jon – boats; new – 1 sheet boat plans; 1 now using the p-2 system of stitch and glue it avoids the problem by using a fillet made from a polyurethane. Welcome to spira international home-built boat plans. spira international offers a wide variety of different power, 11′ ultralight stitch and glue boat;. Free plans for stitch and glue boatbuilding. many good free plywood contruction stitch and glue boat plan. stitch and glue plans are good wooden boat plans for beginners..