Separated, and countersunk the rivet holes, then deburred and primed the nut plate brackets prior to riveting. Once the nut plates were riveted, then I used a AN4-5A and a clamp to hold in place until I got one hole drilled. Once that was drilled then I used a cleco to hold in place to drill the other hole. This worked well for the wide angles. See next post for the narrow angles.
Countersink and nut plates attached
clamped in place to final drill #30 holes
Clamped and drilled first hole, then removed clamp and added cleco to final drill the remaining hole.
