Thanks GPW, I'm shooting for somewhere between “very nice” and “presentable”. It is always a plus when others comment favorably on my efforts!
Dale, the plan is to apply Grant’s ‘D’ shaped 3 rib hollow foam hatch weather strip on the underside of the hatch near the edges; along the front face of the “bumper” (at the bottom of the hatch) and along the front side of the hatch hinge spar. The gap that I am setting now is just for the canvas wrap clearance. Once I am confident in that, I will us a rabbeting bearing bit along the profile at the outside edge of the walls in the galley area. This step will give the wall canvas a place to wrap and die into the lip of the rabbet, as well as providing the gap needed so that the seal does not get over compressed; hopefully with the added benefit of a partition or cofferdam effect should any water get past the seal.
WW, Ah, that would be a handy tool; an adjustable edge gauge. I was watching some youtube woodworking stuff this weekend and saw a couple of good examples of shop made ones. I liked Matthais Wandel’s version of a trammel.
Also, John Heisz’s Marking gauge.
… but then I guess looking at the videos is enough of a distraction from the build. Let alone building one of those. For now, blue tape and a stick will get the job done!