Zero engines...
Would you believe, a friend of mine had a G-62 in his. Yes the head stuck out, but it wasnt very offensive. Needed the weight anyway. It was a bullet, and would have been faster had he used a prop to put the engine into the power band.
A g38 will fit inside, a g45 is better for power and for having fun, the 38 will be on the weak side...
Glow is great,
http://www.airrayinc.com/bakerZero.JPG
Though this is a Bert Baker, it has all the deminsions of the Yellow Aircraft. Flown with a Moki 1.8, it was hot. The only warbird I could or rather would do non scale aerobatics with. (what ever that means)
Ray