Ok, this is going to work fine, I boxed in the servo bay with 1/16th ply and interlocked the servo mount with the bottom wall. I then applied aeropoxy to everything I could reach. The fin is now very solid in this area, I will tweak on it a little harder after all of the glue cures and see how it is going to hold up. If you use this method keep fitting the servo cover as you make the walls in the bay, it did not take much deformation of the glass to make the cover fit less than flush. More pics to come!