Far a diversity of options - some have left an overhang. Although this picture was taken for another reason, it shows what I did. As it turns out, I didn't have the butt rib quite high enough relative to the end rib and did have two very small locations where the overhang rubbed the wing. Since I don't and hopefully won't be swinging my wings it doesn't matter in my case. Observation - Eddie and I were typing at the same time. His idea to chamfer the edge makes a lot of sense.

Butt rib to fuse closeout small.jpg