Sorry I'm posting so much but I'm doing such an extensive refit so I'm compressing years of repairs into a few months of blitz.
I have removed the majority of the interior trim to repaint and I've come across an area that seems to have been leaking for an extended period.
I didn't take a photo now that the trim is off (off the boat currently) but it appears that the corner frame is bolted through the deck and through an iron plate that was fiberglassed in. There is noticeable corrosion on the bolt. My thought is that there is a bolt going through the inside corner of the aluminum upright through the deck.
Long story short, I'm guessing the water ingress is from the windshield but I'd like to sort out the corroded corner bolt and any information on the assembly of the windshield corner would be immensely helpful