While pondering my next move on the bottom planking, I finally got around to trimming and sanding away the rest of those Raptor staples on the transom. It just took a few minutes, and I was done. Those things sand away in seconds.
I’ve hand-sanded the transom with 220 grit, and am currently smoothing it with 400. I’m trying to decide what I want to do about staining the transom before fiberglassing.