Rovineye, I can understand your concern with using hinges that may be too restrictive. The Bimini hinge however looks like it has enough play in it. If it needs some more wiggle room I could always machine down the pin a little.
The galley hatch geometry does have me scratching my head. I’m also considering using a hydraulic assist hinge for the galley hatch. The problem with this is the gutter and hatch stiffener may be in the way.