Didi sport 15. build yourself a mini sportboat ~ economy of plywood ~ modern radius chine hull with topside chine ~ stitch & glue cockpit & topside chine. A scratch built rc boat hull easy and inexpensive. learn to scratch build with this simple project. plans are available for download.. Baby bootlegger. this iconic racing boat was originally designed by george crouch in 1924 and went on to win the 1924 and 1925 apba gold cup. our plans for this boat.