I added hatches for flap servo access, because of murphys law. if i didn't put them in now i'd need them there later. the re-location of the flap hinges allowed the horn to be installed "upside down" into the flap, so the pushrod is hidden within the wing, less drag, and looks a bit better. I'm also using mini servos for the ailerons instead of a single unit in the centre, which would work fine on a flat wing, but on the corsair there's just too sharp an angle of attachment from the snake to the servo, as shown on the plans, i suppose if the servo is upside down it would be smoother, but 2 servos is just as easy of a modification.