Going to try to knock out a lot of the countersinking during the week before and after work.
Mon morn - 0.5 top front done
Mon evening - 1.6 finished top, primed the holes, cleco'd nut plates.
Tues morn - 0.9 top tank plate nuts riveted, gauge made, finished tank countersinks and primed
Tues pm - 1.0 bottom counter sinks
Wed am - 0.5 bottom counter sinks
Wed pm - 1.5 finished bottom counter sinks, primed holes, riveted bottom tank plates, access plate, countersunk screw holes. Done.

Had been using the cordless drill for countersinking but switched to the air drill. Works better and much less fatigue. Wish I had switched sooner.

Developed a better system too. Make one pass and try to get 90% of the hole, then get the remainder on a second pass. I was finding if I tried to make 100% on the first try, I was having to go back and clean most of them up anyways.

Right spar counter sinks are done. On to the left.