I'm 6'-7.5" and fit easily in the RV-10 that I built. The only thing I did to improve my fit was to have Oregon Aero use one less layer of foam in the seat cushions, which reduced their height by about 1/2 inch. The seats still feel great, and others who have sat in my RV-10 haven't even noticed. I'm not sure I needed to do this, as I fit fine in the Van's factory RV-10 that I received my transition training in, but I'm happy to have a little extra headroom for my headset.
Cheers,