Thanks for the replies.
Down the road I want to close in the transom and put on a bracket. Any thoughts/concerns on this design?
-2" motor mount (Coosa bluewater 26 1.5" + .25" 1708 w/ epoxy on each side)
-.25" skin on floatation chamber
-3 1"x8" structural members made of (Coosa Perhaps) w/ 1/8" skin
-Deck cored with Divinycell in three places like Strick's
-Deck joined to flotation box with adhesive at junction and tabbed in on the outside underneath.
-Access port on the deck w/ rigging coming through as well.
-I intend to isolate the floatation chamber from the bilge but still have drainage holes in the spars and a garboard plug.
Still some details to hash out.
I envision making a mold for the deck and a mold for the box. Vacuum bagging the two and joining them after cure.