The Sonnet 10 is designed for children and small paddlers up to 115lbs. Since homebuilt sponsons are critical to successfully completing the Sonnet 10, Sonnet 17.5 and Sonnet Double I recommend that builders first make small "test" sponsons to perfect the technique before starting construction of these boats. Contact me if you are having difficulties. The following link provides instructions for making PVC sponsons. Use the (BACK) key to return.