To answer your questions, I had already put in two servos in the wings for the ailerons. Just built a hatch similar to what has been shown on this site before. I finally decided to do the major surgery on the wing, actually went much faster than I thought with my trusty Dremel. At this point I have all the old balsa sheeting off the front of the wing, also took of the trailing edges and the balsa wingtips I had carved (didn't like the way they came out anyway). I bought some dubro aileron torque rods and bent them to fit. Plan to try and finish sanding the wing and install the torque rods tomorrow. Then I will replace the trailing edge at the proper length for flaps. Then all that is left is to cut some flaps out of the new trailing edge stock I bought and resheet the front of the wing. I also pulled off the stock leading edge and replaced it with 1 inch leading edge stock. Will have a lot of sanding to do, but I will have plenty of wood to work with, avoiding the original problem I had with the leading edge which was that by the time I got the sheeting sanded flush with the leading edge, the sheeting was paper thin and would crack with any stress at all. All in all I think the wing will be much better after the surgery than it was before...oh yeah, I bought a YS 91 a few years ago when I bought the chipmunk kit so that is what is in the nose. I'll post some pictures once I get it all done in the bones.