: P.S. ( Something to ponder: Building an entire boat sized Sea-Sack(sock) to
: line the inside of the entire boat. Then sew bulkheads into that and sew
: it to hatches and cockpit rim on the underside. Then sew the outer skin to
: the hatches on the outside. This would give you waterproof hatches,
: cockpit and plenty of air around the boat for floatation. ) ??? ( any
: takers? )

Hmmmm.....

How about just attaching a "mini sea sock" to the hatch? It would act like a dry bag with access from outside the boat. Inflate it, and you have flotation. Inside the boat it might act something like a bulkhead, although it wouldn't prevent water from travelling around between the bag and the skin. It would keep the contents dry, though. You could pull it out to dry, too.

Maybe on my next boat...

Travis