I have the same plane. mine is an arf. i already have the o.s. .61 on it. i run a 13x6 apc prop. I have done no reinforcement but i have removed the two side pieces of wood next to the engine. I previously had an o.s. .50 on it and had vibration problems. with this set up, the plane will hover, snap, knife edge, and do most other aggressive maneuvers. ive ran this setup for almost a year now,and the only failure ive had with this plane was an aileron coming unglued. a definite hot rod but gentle when you want it to be. i added a little weight in the tail to balance, but wing loading is still super low.