hi andrew,
glad to help but please, please, slow down. the idea is to have the rib fairings on the top of the top spar and on the bottom of the bottom spar. this will give you a much better finish to the wing root. much more scale-like and well worth the effort in the end.
thinking further ahead, if you fit a large curved fairing on top only, it could be difficult to fit the top sheeting because the sheeting goes from a concave shape at the fairing to a convex shape towards the leading edge. in other words, a compound curve. not easy to work with over a fairly small area. just something else to ponder over.