I thought about moving the servos to the rear of my latest SSE but I'm glad I didn't. The plane came out very tail-heavy as it was with a Super Tigre 45 up front. If you were to do rear mounted servos though, it would just involve framing something out of light ply in the lightening holes toward the rear fo the fuse. If you keep the servos in the stock location, throw out the pushrods that come with the kit. They'll change lengths whenever the temperature changes even slightly. I'd go with solid 2-56 or 4-40 rods, carbon fiber, etc. A .70 sized 4-stroke should fly the plane excellent. I hear the Saito .82 isn't too bad either.

As for building the SSE, it's an excellent kit that you'll enjoy.