I've thought about it a lot, but haven't done any experimenting yet. Seems like a big leap to take based on other peoples experiences, but so is the whole project if you look at it that way!
My thought is to "jamb" the doors, door window, hatch seal area, vent fan cut out, and around the front locker bump out with more compliant bed sheet; then using canvas do the side walls wrapping into these areas with darts/triangle cuts as needed; then the roof/front wall overlapping the side walls.
Areas of concern are at the top corners of the hatch going from the side wall seal area to the hinge spar rear face; where the side wall meets the floor at the back edge of the galley; and how the canvas might build up in the door openings (I will cover the doors last so that if I need to I can trim them down as needed to set the gap correctly, making sure the doors can swing).
My windows are flush mount into the doors, so there is a concern there getting the canvas to wrap into the rabbet and lay down nice and crisply around the edge of the glass (have considered making a mold plug to press the canvas into the window recess while it dries).
Also, I haven't figured out what the transition will be between the edges of the doors and the inner ply skin. At one point I thought about leaving the inner skins off of the doors until after they were wrapped in canvas, then overlapping the canvas edges with the inner skin, but decided to laminate the doors with the walls so that the grain would match. In hindsight, I should have just used the doors as a plug while vacuum bagging the walls, then glued the cutout skin back onto the doors later, after canvas. My concern now is that if I end the canvas on the inside edge corner of the doors, it may try to lift with any abrasion in use, and it will leave the inner plywood skin edges exposed to moisture outside of the door seal. So I may end up wrapping the canvas in over the inner skin just enough to be under the seal, but not show inside of the cabin. the door edges, jambs and hatch seal areas will all be "jambed out" with black paint, so if I paint this inner wrap of canvas to match it will disappear next to the door seal trim when closed, and hopefully just look like trim around the door when open.