: I would like to install flush hatches after joinging the hull and deck. I am
: looking for ideas on how this can be achieved. Any help would be
: appreciated. Thanks.

One tip I picked up somewhere, perhaps Redfish, was to have the spacer below the deck slightly protrude (1/8" or so) into the hatch space flush with the bottom of the deck. This provides a ledge for the flush hatch to sit on and registers it so it does not cinch down lower than flush with the deck.
__________ ________
Deck______|_ ______ Hatch
Spacer |_____|____
Ht Lip |__________|