RE: One wing or two
There is still a need for a simple, low cost 2mtr Pattern aircraft.
In the past there was the Arresti, which had it's production problems, but was a simple(in it's fixed gear version) no fuss model that flew straight, and true.
You could fit it with a 140rx, 160fx, or a YS. It needs to be cheap to buy, plug in wings, and SIMPLE.