Wooden boat plans developed by a boat design expert & naval architect. all boat plans come with free 3-d computer models & free master boat builder course.. Frame patterns on keel and stem. stem pattern used to form keel and place stem. this is the real zephyr, a 16 foot stepped hydroplane! reproduced from the original offsets and plans by a.a.apel.. Wooden boat plans for amateur boatbuilders – excellent performance, simple construction, step by step instructions australia, usa, uk, hungary, s. africa.