i am looking at a kitfox 4 wondering what kind of engines can be put on thios airplane. also dose this have short wing. can tou make a 4 a 5 or 6 or7 and what is the differance. I weight 235 lbs daughter is about 134 I am looking for a kit that will blow tghe doorws off a Rands s6 or s7 will the licomining fit on a model 4?