OK, I took A shot of A plane I'm starting to recover, this should sort of give you some ideas. The hatch is an easy way to mount the servos, how you mount the hatch is up to you, I use corner gussets, beams and anything I can think of, all depends on the plane and how much room I have to work with. First shots are the normal old hatch with beam mounting. There is rib cap stock around the hatch so I have something for the covering to go onto. Very easy way to do it. The big red wing is an ARF, I haven't A clue as to who made it. The servos are mounted inside the wing straight down/in and also an easy way to do things. There are just two hard points glued/epoxy in the wing for the servo to mount into fore and aft. The fuse you see is another easy way to mount servos on A sheeted surface. This is A Giant Scale plane that the ARF people decided only needed one servo in the fuse to operate the two giant elevators with A stick and two wires to operate each side?? I just cut out the fuse, added some ply on the inside of the holes for the screws and mounted A servo on each side. I have done stuff like this on wings too. Just let your mnd wander A little and you will come up with something. When I set up the plane OZ is showing you it was designed for two wing servos but it was almost the same as the first two photos I'm posting. As I recall the servo hatch just mounted A little different and I did use after market servo arms on it too, sometimes you just have to use them. SIG gives you the hatch but you have to epoxy in the mounting rails for the servo size you are going to use. Hope this helps some.