One other real nice thing about gas engines is the finishing work, I like to build planes that were fabric covered like old time WW1 and vintage stuff.. you can just buy dirt cheap acrylic paint at the craft stores, and clear over it with Rustoleam... I painted and sealed a 1/3 Pup for about 30 dollars. The exhaust from the gas engine doesn't hurt the paint a bit. In fact I leave it on just to look scale..
I painted a few planes for friends in the past with stuff like that Perfect Paint.. WOW, you wouldn't want a cloud of those fumes in your house..
Right now is the glory days for prices on the glow motors for sure..those that love them I hope are stocking up.