There are locations in the kit that things get really tight for the pre-punch technology. In my opinion, this is a good example. To me it would be better if the .125 holes in the end rib were drilled by the builder.
I had to change the radius on the end rib between the rib and the flange. Your third picture shows that if the end rib moved more "into the corner", the pre-punch holes would better align. A smaller radius would seem to accomplish this.
Lee's Summit, MO
RV-8 - Empennage & Wings Done
Working on Fuse
1946 Cessna 120