Made some progress in between spar sanding/painting and rigging projects...
Running headliner boards
Meticulously removed all the staples in the running boards on both sides of the deck head. Started sanding the boards with the Festool RO 90 in ROTEX orbital mode (aka 'chomp ba chewy chomp' mode) and 60 grit paper. I have 40 grit on the way.
Parts of the wood are rotted from water intrusion and rusting staples. I tried to demo part of one of the boards, but it's overly time intensive and there is still a lot of resin and wood leftover. The question I'm pondering is whether to fair over the boards or try to demo them. I don't think they're intended to be structural, but I would bet they are adding some longitudinal support to the cabin top with the resin they are glued with. I'm guessing the resin is probably vinyl-ester, since that's what most boats were built with in the 80s.
If I leave them in place, I think I'll need to treat with CPES or other penetrating rot-stop epoxy before fairing. Good thing epoxy bonds to vinyl-ester.
Another look here:
Fairing at the bulkheads
The headliner covered up the gaps at the top of the bulkheads and then the teak trim pieces covered up the staples. Now there won't be a headliner and I need a backstop for the fairing compound. Ericson glued the bulkheads to the deck head by glassing in a couple strips of fiber. I could continue by glassing in some more fiber in the gaps. It might be easier and more simple to cut some then veneer wood and glue it in place.
Note the wood rot at the top of the starboard side bulkhead. Probably more CPES needed there.
The fasteners and washers just above the opening portholes are holding the inside track for smaller headsails. I'll need to pull the hardware, re-drill, and re-bed new bolts, washers and cap head nuts after the fairing is in place.
Also, the dorade box drain was corroded to a broken state. I think I know another channel for water intrusion now