It seems from your pictures that your intention is to raise the deck and place the floor above the previous deck resting on the top of your approx. 4” rim. If that is your intentions than you will be raising the stringers to support the new deck and glassing the new deck into the gunnels and resting on top of that 4” rim. If this is your plan you should be ok. But if you are going to flush mount the new deck to that 4” rim (not raising the deck height) you could get stress cracks from weight on the deck and from the pounding of waves that will torque your hull and probably your deck in ocean conditions. So if you flush mount the new deck additional support under the 4” rim that crosses 2 -3” past the edge so the new deck can also rest on it would help. PLUS the flush glassing process of the old and new deck will need to be done like you would do if you were repairing a hole in your hull by flaring out the two edges and building it up with glass work to fuse them together.
FellowShip
Just for the Grins
