The earlier post about a kit fro the RFB-600 Fantrainer being out of production is correct.....has been since '92 or '93. I designed a Mk 1 version in '97 adn redesigned it for a Flying Models plan in 2000 (June,2000 issue I believe).
It can be built as a fixed gear, or retracts can be installed. Top speed si only 80 mph or so, but you can do every aerobatic trick in you skill, and then pass the transmitter around. (Ok, I'm biased, but at the GSW a few years ago we had 7 people on the sticks in one flight.)
Add to the fact that it will only set you back about $100 dollars, adn uses an inexpensive ASP or Super Tiger engine......
Check it out at Carstons Publications....it's a fun airplane.
Greg