These ribs are repurposed RV6 parts. They have a nice joggle in the front that looks like it should tuck up into the flange on the F-705. Unfortunately, they are about an inch too long, so you end up cutting about 1/2" off each end, and then building some clips to take the place of the joggle.

Couple of things;

Lots of people have edge distance problems with these clips if they're made to exact dimensions called out. I think I will as well and will likely have to remake these.

Also, the outer edge of the ribs need to be flush with the edge of the belly skin. Unfortunately, they aren't manufactured to exactly the same angle. If I have the front part flush, then it's off by almost 1/8" by the time you get aft, or vise versa. The error is the same on both sides.

I don't know if it's more important to have it match on the front, the back, or split the difference, so I threw it out there on VAF to ask what most people do here.