Just a tip - if I were to do it again I would install those nutplates for the wing root fairing on the upper main wing skin BEFORE mounting the wing. These holes are pre-punched on both parts, and the gap between the upper wing skin (where the wing-walk doubler is) and the fuselage sides skin gets very narrow - I had a brutal day yesterday installing htese nutplates, trying to squish my hand down in there with my tungsten bucking bar to rivet those nutplates on. The ones where the wing root fairing meets the fuel tank have to be drilled in assembly (fuel tank not pre-punched), but there is a bigger gap here and it was easier to get the bucking bar inside. Even so, in a couple of spots I had to resort to using cherrymax blind rivets to hold the nutplates.