Like with the nose ribs, I need to cut out the front corners of the main ribs to fit between the top and bottom of the spar caps. Then gussets are added to strengthen those corners. And finally I had to align the rib on the holes in the web, clamp it in place, drill the holes using the holes in the web, and cleco it in place.
Rib #1 is done and cleco'd. Rib #2 is made, but not yet placed and drilled.