Started drilling and cleco'ing the vert stab. I'm not going to do more than the back end of the ribs and the tip rib until I have the AN3 bolts for the bottom of the assembly. Then I'll install the lowest rib to set the outside edges of the tail. Then I'll come back and install the final 2 center ribs.
This thing is a real bi*** to hold together for drilling! I only had me, but it would have been a lot easier with another pair of hands.