jollycub, you are facing a strong problem of less than adequate structural strength for such a weight up front. BTW, a .15cc is equal to a .90 glow engine. You can figure, for reasonable close, that 10cc is equal to .60 cubic ins. engine.

Let me give you an example: There have been numerous examples, in this area, of big gassers departing the airplane. Mostly on ARFs but a couple were machines designed for lesser power plants than the ones the owners bolted on the front ends.

One I witnessed: Modeler hangs a G-38 on an ARF designed for .60 to .90 glow. He thought it was the King of Kings. Well he made a rather hard landing, but all looked OK. Then he started it up again, and was taching the engine. Well that engine had a mind of its own and desided to fly without the airplane. Modeler learned to live without the thumb and first two fingers. THAT SIR IS WHERE YOU ARE HEADING! [:@]

I examined that firewall. I would not have put a .60 on it without significant additional structure on the fuse. ahead of the wing. Many ARFs are like that. I restructure maybe Overkill, but still have 2 thumbs and 8 fingers.

I have a Kadet Senior for initial training of newbies. It has some structural beefing-up in a few areas. It flies well on an OLD Bluehead ST. 40, 11-4 or 5 prop.

No matter your finish concerns, I strongly sugest that you redirect your thoughts about power application on your model. Painted finishes do well (1) use a good fuel-proff paint and/or a good fuel-proof overspray, and (2) if you clean them up well after a session. I have done and failed to have done such for some 65 years now. I well know the differences.