RE: Glow 2 Electric
Just as an FYI, the power systems recommended aren't limited to just the plane being discussed. They will, of course, power planes of similar size, weight, and flying qualities.
The Piece-o-cake, if the 72" version, is the .049 powered version. I believe the Butterfly is the 100" .10-.20 glow powered version. So, this plane needs very little power to fly. Excessive power will not cause excessive speed, but may cause wing flutter. It'll definitely climb well.
Be careful with your modifications. Ailerons will have limited usefulness on the polyhedral wing. BTDT.