Sorry for delay, just picked up the thread.
I finally placed plywood fore and aft for bulkheads. Took a lot of time and effort. I first considered placing two 3 meter boat stern bags in the bow and closing them in with a removable foam bulkhead about 2 inches thick to serve as a stopper to prevent area around bags filling in case of a swim. I abandoned that idea in favor of placing the ply bulkhead. At first, I thought of putting a tube along the sheer inside for drainage, but that lost out to installing a 4 inch Beckson deck plate in the center of the ply bulkhead and drilling a small hole up top for pressure relief. I was able to slather some resin/wood flour mix around the margin on the forward side perimeter of the bulkhead and glassed in the more accessible aft side as thoroughly as I could with 6 oz tape. Reaching long, I can just get a sponge into the forward compartment and could insert a float bag, if I so chose. This operation cost me a lot of weight.
The rear 8 inch deck plate functions very well. If I decide my permanent skeglet does not function as well as I would like, I have access to put in a skeg box.
In 15 kt winds, it has done well to foil weathercocking.
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