On my Tartan (#198) the PO rebuilt the area around the mast due to water intrusion. That having been said, I would not use Starboard nor plywood to rebuild. Resin will not adhere well to the Starboard and marine plywood is treated with chemicals that also retard adhesion. I would suggest Coosa board (aka Penske board); it comes in different densities and is made of fiberglass and resin compounds and is specifically formulated to adhere to fiberglass resin. Saturate the surface well and then apply the impregnated glass.You can also tack it into place with Bondo to get it to stick while the resin "kicks" (catalyzes). You could also use a temporary mechanical fastener or support.
An alternate approach is what I did when I glued a large piece of prelaminated glass (actually, part of an old mold) to the underside of the foredeck for a support for my windlass using Crestomer. The adhesive kicked in twenty minutes and the bond is stronger than the glass itself. So, you could prelaminate glass to fit your affected area and then bond it in place with Crestomer or Plexus. No mess and a great bond and nothing will ever rot (no wood).
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