As promised, pics of the Hull.
I have filled and sanded most of the screw holes on the near side in the top pic. And as of about half an hour ago, I have filled the remaining screw holes.
The Epoxy, Glass beads, and microfibers sands easily. It seems like a good mix for filling.
I used a router, a roundover bit and a batten to round over the entrance to the CB for glassing.
And I have glassed the transom. This is a small and uncomplicated area, but it's near vertical, so you have to be careful about runs.