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This triangular thing is the bottom of the fiberglass and balsa sandwich that the foredeck was composed of. The dark brown stuff is rotten balsa. I cut the fiberglass bottom panel out using a grinder with a cutting disk attachment. The balsa was sopping wet and rotten. It just fell out in chunks after I removed the bottom of the sandwich.

I've since confirmed that in all the places that use balsa core the balsa is wet and rotten, mostly due to badly bedded deck hardware that allows the water to enter the core freely. This includes most of the cabin top and side decks.

Everywhere where solid fiberglass was used is in very good shape.