I finally got the first coat of varnish on today. I started off with finishing up the sanding.
I didn't quite get the surface fully uniform and smooth. There are some areas where the cloth was starting to show through right next to low spots. You can see what I am talking about in this picture:
I decided to stop sanding there. There are a few occasional low spots, and the surface is a bit bumpy, but it is good enough for government work. The exposed cloth areas disappear in the varnish, so no big deal there. Here are some pictures during and after finishing the varnish:
Over the next week or so, I'll just be adding coats of varnish. I am not sure how many exactly... probably 7-10.