There are 2 ways to mount the servos. I mount them in the fuse and have just the horn coming out if the stab for a cleaner look, you can also mount them in the stab if you choose too. After the stab is set then I will cut out the fuse for the servo. Then you will need to hollow out the stab and cut a slot for the servo arm to come through. I will then put the stab in place the mark where the rudder servos will need to go ( if you are running the standard rudder then the servo will mount in the tray under the canopy and pull pull to the rudder) this is only done with the split rudder. I then add light ply for a backup plate to ensure the screws have something to hold on to.This does not effect the CG ( I just move the 10S pack forward)Once the servos are mounted you can hinge the Elevators and the rudder and hook up the controls. I use the Central Hobbies BB rod ends and .70 Solid Carbon rod and CA in place.

Servo Arms DUB673 (the horn with 5 holes used on all serfaces)
Screws CHMSMS100 from Central Hobbies