I have a Focus ARF, and I assume the servo setups are the same as the ARC. The elevator has a pushrod with a "Y" at the end, and the rod rides in a bearing at the rear of the fuselage - not a bad setup if you get it aligned fairly well - pushrod needs to be just under the pipe tunnel. The instructions suggest putting the servos side by side, but I like both of them centered so I put the rudder servo under the elevator servo and they're both centered. I used a wheel - pull pull on the rudder. The system used for the rudder control horn (a bolt through the rudder near the hinge line) results in some slack in the cable during deployment, so a cable ty on each side of the wheel to hold the cable in place keeps it from jumping off the wheel. As far as using a servo in each stab half, I don't think they are thick enough to house a servo. Maybe you could put one on each side of the fuselage under the stab for each elevator. I've done it both ways on different airplanes and I like them in the stab.

Actually, the setup as decribed in the instructions is pretty well thought out and isn't too bad. The only change I made was centering both servos, one over the other.