Bill,

The ribs and spars will be located exactly as they are on the original Pica plans. The picture i attached just about how I try to make the ribs. Instead of drawing several ribs, I drew only one, at the section C-C on PICA plans and projected across the wing. And that time just for to try the idea. It seem to work. By my knowledge the ribs are same across the wing, but have different "dimensions" etc. due to ailerons etc... By this way I can get the exactly shaped wing ribs.
Well, research of the real wing construction not seems to be easy. I only find some pictures from WACOClassic, and by my knowledge here in Sweden we do not have a real aircraft.

Laszlo