The Jupiter Duck has 8 degrees of dihedral for each wing panel. On the plans it shows the midrib tilted 8 degrees during construction. With the rib tilted there will be a small gap where the rib doesn’t touch the wing surface. So I came up with a way to make a good gluing arrangement. I made a 3 layer midrib, then created a guide from wooden yardsticks such that the midrib is held at the 8 degree angle. If I would have just cut the angle into a single rib, there wouldn’t be much rib left. Probably could have used just 2 ribs. That would have worked fine. Next time. The first picture on the right below shows the part that holds the rib. I used double sided crafters’s tape for that. Then I used a hotwire to cut the angle. Worked great. Took a little experimenting to get here.