Did you squirt some glue (thickened resin) up behind the liner on the sides? The liner usually isn't glued very effectively to the hull side and you tied into that. Hopefully you glued the floor to the stringers well, so that will keep everything tied together.
No, I didn't do that. The previous 3(!) decks were tied in similarly to only the liner, so hopefully there won't be any issues. Yes, the deck is glued and screwed into the stringers and all bulkheads and reinforcements, and tied into the transom and foredeck (which is newly reinforced with two bulkheads that are attached directly to the hull). It should be pretty sturdy (I hope!)
Here it is fully glassed over, today.
Thanks for looking - Paul