I've only designed from scratch a couple foamys. Scratch built from measurements of a PT40 a 40" span foamy trainer. Scratch built from 3 views a 35" span ultimate biplane and a 20% spitfire. Scratch built from plans a profile edge 540. I have most recently been flying the previously mentioned spitfire and edge. As far a pattern experience, I flew a Hobbico Spectrum and GWS formosa for a couple of years. I am building this for personal use, not as a design to market or to use in competition, but that doesn't mean I don't want it to be a good design.