I did this page out of sequence in order to build the wing on saw horses instead of the table.
The ribs are clecoed in place, prior to riveting. I try to double check everything before committing to rivets and it paid off. The inboard rib is flat out upside down (equivalently: flanges inboard instead of outboard) in this picture! Quick reversal, and all was well...
A nicer picture showing the lightening holes aligning well.
This is even cooler—the nose rib cutouts that will accept the upper skins are also as well aligned as anything I can photograph. It helps me feel more confident that I’m going in the right direction.