Ed:

So when you mount the servo how do you reinforce the area that you screw the servo into? You said you glue in some light ply....does this meen that you make a cut exactly the size that you need for the servo then somehow insert the ply through the hole you made and glue it? I wish I could see your plane or pictures of it without the servo installed so I can see how you it was reinforced.
I know that would be a pain in the butt.

Jay