Mounting the aileron servos is next. The wings come covered so the servo hole needs to be cut out. I always use a new blade and cut the hole out and leave 3/16 inch all the way around and iron the excess into the servo hole. I then cut the rails (using 1/4 x 3/8 spruce) and pre fit all rails. Then I will use the calipers to set the depth of the rails. Once the rails are glued in you can mount the servo. Since all of the servo leads are always too short you will need to use an extension. I always use heat shrink to make sure that they don't come unplugged. This plane has SFG's so the slots are pre cut but the covering and or paint will need to be removed. On the painted wing you can use some sand paper to clean the edges. Then just slide the SFG into place and CA.