Hey Jonny..looking good man.
I was wondering if you took the gelcoat off under that ply on the inside before you installed it. I noticed the braces looked to be directly on gelcoat. I also havent seen any glass tabbing for the additional ply. Looks like its fiberglassed..but not to the transom. Unless I missed a picture somewhere, It looks like there is really no grinding to raw fiberglass on the inside at the transom. I see some sanding/grinding where it looks like your going to tab the deck in..but not down to fiberglass yet.
In any case..you really should be removing All the gelcoat before you laminate. Just FYI.
Hell-of-a stringer system that much is certain
