[Mithrandir]

Use "Top Down" design methodology. Make an assembly and a skelaton. The skelaton consists of the OML or primary lofted surfaces and could include a datum plane at each rib station... the Skel can also include the Curve which results from the intersection of the wing skin IML.. (Inner mold Line).. or the underside of the sheeting... and each plane....
In Pro/E, you make the wing surface, make the plane, make the intersection and then "Pattern" the planes for each rib... then you can easily Pattern the intersection curves... maybe different phraseology in SW... but prolly the same process...