I am currently building the bottom wing of a Hog bipe And I am going to put dual servos in each wing panel. In the past i have " stiffened " the ribs in the bay with some ply and Installed servo rails. When it is said and done I do not use a access but rather install servo top flush with wing with only shaft arm above. I also make a "servo well "

Any other methods or ideas? Lets hear what ya got