I just finished building a Tiger 2 at at the suggestion of my instructer i converted it for dual aileron servos. It is MUCH easier to just cut the hole in the middle of the wing a little bigger and install two servos right next to each other. there is plenty of room inside the fuslage . do you have your radio gear yet? just lay it out and see for yourself. place on sevo where suggested and then stick another one right next to it. i just took a dremel and widened the hole that was already there for the original set up. it literally took 5 minutes to modify it for 2 servos. Dont overenginer a simple solution. if you want i will post a picture in the morning. i am tired right now and my plane is out in the car.