A couple of tips on servos. I prefer GWS NARO D+ servos but I had another brand in my parts drawer so I used them. I think the GWS servos are more reliable but I saved some money by using what I already had on hand.
Before you permanently instal the aileron servos in the wing be sure to connect them to the receiver and make sure they are centered. If they are not centered when you install them you will have to cut into the wing to get the control horns off and reposition them.
Also, I used GWS glue on the servos where they contact the wing but also put a drop of epoxy on and under each tab. The last thing you want is for a servo to come loose.