I have a GMS 76 in mine (only spare motor I had lying around) I made a hatch near the tail and installed the battery there. The rudder and elevator servos are mounted behind the wing. I also installed pull pull for the rudder. I was lucky and added no weight to get the C.G. where I wanted it. I hover at half throttle.
I did cut out my own engine mounts after reading a thread with complains of the original mount breaking.

This is a great flying fun fly. It replaced my Uproar after it was destroyed in a midair after over 500 flight. The only issue I have is it does not like to snap or spin despite my CG 2 inches behind the recomended. I take this out whenever I hit the field.
Enjoy.