Yesterday I continued sanding the cabin. After sanding for about an hour and a half, I decided to rest my shoulders and focus on installing the two main saloon bulkheads. I'd coated the ends of the bulkheads in epoxy a few days prior, so after a water rinse I placed one bulkhead and used a couple shims hot-glued to the hull to hold the bulkhead square and level while I placed fillets around its edges. The port bulkhead in, I did the same to the starboard bulkhead. It feels so incredibly good to have begun reconstruction. This day has been (far) too many years in the making.
The next three pictures are of the sanding progress. The white interior paint was flaking and mildewed in spots. I'm taking the surface back to either fiberglass or what appears to be a lightweight fairing compound Whitby used originally. I'm thinking about using Petit's EasyPoxy when it comes time to paint the interior. In the FWIW department, I timed myself sanding an area approximately 2'x2'. It took me 25 minutes. I estimate there are about five 2'x2' areas remaining on the cabin overhead. That's 2 hours of sanding left to do.