Work is still keeping me pretty busy, but I put in an hour or so tonight. I first reassembled the cowl to see where I need to do some further sanding.
I spent a little time on the side joints to get them as flush as I can.
I also opened up the gap between the cowl and firewall all the way around to 1/32″. I don’t know for sure if this is a sufficiently large gap for paint, but I can always open it up further before taking it to the paint shop.