After much checking of the plumb bobs, positioning of J-stringers, and cups of coffee drunk, I drilled the J-Stringers and match drilled theft fuselage. Went fine, but I'm definitely a measure twice cut once kind of guy, so I rechecked for fuselage twist after every bay, so it took a while.

The instructions said to drill keeper rivet holes through the F-712/WD-409 a few steps ago, but it seemed to me that would make it problematic to adjust for twist if it was done before match drilling. I drilled the holes through the F-712 earlier, but held off on match drilling through the F-712 until I was far enough along with match drilling the J-channels that there was no chance of needing to adjust for twist. Match drilled thru the WD-409 and clecoed, which helped to lock everything into place.

For reference- I don't see any way to dimension the keeper rivets off the print without measuring off of the vert stab aft spar. I was able to narrow it down to approx 5/8" up from the lower tooling hole in the F-712. Somebody on VAF told me they had measured it out at 19/32, which is pretty darn close to 5/8" so thats what I went with.

Will drill the sides to belly skin tomorrow and then take it all apart for de-burring etc.