Restoring a boat - having trouble with the windows.

[oceanmaid]

Hello,

I am restoring a sunk fibreglass boat (18' Campion Christina of no value) and am trying to reseal the windows. They are anodized black aluminum frame windows that had some raw aluminum trim covering up the edges on the outside. I have all the fasteners I can see removed and the windows are ready to come out but I am hung up at the corners. The windsheild windows are attached to the side windows somehow but I can't see what is stopping me from removing them.

Does anyone know how they come apart?

Thanks in adavace for your suggestions.

[Bergalia]

Close-up pics of window corners would be helpful. Any chance ?