Drilled and cleco'd the wing root ribs (2) which add a foot or so of wing in between the flaps and the fuselage. A little less than an inch has to be cut from the end of the lower stiffener so that the rib will fit into place. Had to drill out about 6 rivets so that the aluminum pre-bent wing skin would slide up underneath the bottom panel. Drilled and cleco'd both sides so that it would be solid in order to guage a starting point for the flap/aileron alignment. The kit also comes with a jig of the proper shape of the upper part of the wing. Root ribs, flpas, ailerons were all checked and looked good.