There is nothing wrong with flying without ailerons. That's the way I learned to fly 30+ years ago, and I still have several planes that are rudder/elevator. Most flyers today haven't flown a plane without ailerons so they don't realize how well they fly. You would be surprised how aerobatic a rudder/elevator plane can be. To a good instructor, it doesn't matter if the plane has ailerons or not, only that is controllable in all flight regimes. The Sig Kadet was designed with out ailerons for the simplicity and flies just fine with out them.

Now if you want a real challenge, try single channel - that's rudder only. No throttle control, no elevator, and no ailerons.

Hogflyer