My "end rib" step is a little weird because I followed the CozyGirrrls' technique and installed the rib with the rest of the strake parts. This was done while the wings were attached, then scribed and cut to the profile of the inboard edges of the wings. This will produce a very good match to the wing profile, and, ideally, minimize the finishing work in this area. This area is normally filled with foam but I left it open for now. The plan is to put storage compartments in here for spare bulbs, tire tubes, etc.