The ARF comes with a push rod system. I chose to use 2 Digital Mini MG's in the tail (5245's). I don't have the servos yet, but this is what I did to the airframe...
1) I wanted to cut in a little higher, but there was a rib traveling to the tail that I did not want to cut into, so I went just under it.( see picture 2)
2) Used 1/8" ply and cut out U shape that runs to rib and back to tail cross section piece.
3) Ran some 1/4 square across to tie everything together.--pictures don't show that I have 2 in instead of 1.
4) Used 30min epoxy

I am no master builder, so take this example as just what one person did--not as instructions of how to do something like this.