I've been doing a bit of research and planning this week before I jump into the hatch and roof spars. I'm thinking of using a geared continuous hinge for the hatch. It is, apparently, much more weather resistant than your typical piano hinge. Has anyone had any experience with these???
I'm still planning to use a rubber seal over the hinge so I'm not sure that a geared hinge is really needed. It's just, yet another, obstacle for any leaks to get past.