4 ribs at the butt end of the wings will need to be notched to pass the spar fittings. Double uprights are needed where the front and rear spars pass through.
Each rib had to be built in 2 stages.
1. As previously done but leaving out the gussets on the back side of said vertical uprights as well as the diagonals which intersect. 2. When dried, flip over, measure, cut and glue the double uprights into place as well as the now slightly shortened diagonals. Then the remaining gussets.
This process added 30 minutes to each rib build time blowing out to 1hr 10min per rib!