Alliaj HM ailerons/flaps control horns
Here is a picture of the control horn on the flap. Some builder prefer to integrate everything but I prefered to do different because I don't want any slope on the command.
I position the horn to have the hole just on top of the surface of the skin.
Then I used transparent servo covers.
This allows to have a quick look at the servos if needed.
Another view of the radio installation before I finished it: