A few years back I built a Spacewalker ll, powered by a 110 hp Corvair and it was a nice flying airplane, save for the fact that the Corvair had some reliability issues. During a visit to Sun & Fun, Serenity was showcasing a factory finished Spacewalker ll and they were asking some ridiculous price over 100K. When I told them that I had built my own they were quite rude, and after a short conversation they simply walked away without so much as a thank you. Perhaps that's why it is called a Spacewalker. See my current project on here, a Fleet model 7 biplane. "Sonny" Furman, Col. USAF ret.