Planebuilder66 has 'got it right on the money' in the above post so pick your poison! As the saying goes- if you want it bad enough....! If another person designed or built it then you can, too! The 4*40 is very easy to fly and would be a good trainer. I build on a hollow core door covered with a sheet of 1" blue foam. I think another has stated that you can get damaged doors for a pittance at your local hardware store so try that. You'll just have to accumulate the required tools et al to build. Good luck!