I think you'd find balancing the plane with a G-26 difficult unless you added weight to the tail, and why make it heavier than you need? I can think of a couple of smaller (lighter) gas engines with better power-to-weight ratios, the RCS 140 and the Roto 25. Both are roughly the same displacement, half the weight, more power, and also more expensive ($400 dollar range w/muffler). Plus, the G-26 is fairly wide, relative to the width of the Rascal, because of the side carb and side exhaust, and the firewall might not be up to the task without some reinforcement. The RCS and Roto engines are rear carb, and can be obtained with side or rear exhaust. A gas Rascal is a neat idea, though. I've got a 40 size, and if the 110 flies anything like it, would be a blast to fly with that kind of power.