Freak,
Have always been impressed at the speed that you work, opened up and cleaned off and ready for step 2.
The plywood or whatever a boat company uses as a filler in situations like this, if they use allot of glass under and over, is really used just as a form when they are laying up the deck. The form creates a fiberglass box which when hard makes a stiff structural member. So even though no one likes the fact that the wood is soaked and rotting this is not always a hugh concern. The obvious problem is that they don't think or no at the time, unless they are really ahead of the game, where all the fittings and stanchions are going. Those places best left solid glass or another material that won't compress and soak water.
You could use foam as a form between stanchions and make the stanchion areas solid glass matt.
On lighter built boats, and yours seems to be pretty heavy in that area, that filler is more stuctural stiffness.
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