Thanks Kevin, makes sense. I have a bunch of 1" square I can use for bracing. The floor looks like it dips in the drivers side foot well so it certainly seems reasonable to resolve the floor/cab mounts first to get a solid footing...and from there work outwards.
To buoymaker's point, thanks for the suggestion. I already obtained a NOS lower driver's side door hinge, the top seems to be fine.
I think I will adjust the truck so that the frame is itself 100% level (on stands and not tires as is the case now) so that the body should then also be level. Currently the frame is 1/4" higher on one side which I suspect is down to tire pressure differential.
Oh, and I already replaced the mount bushings in case there was play there.
