Wherever you go, there you are.
I wanted the individual branch circuit switching in the Weatherdeck panel. If I didn't, then yes, my original 8 position fuse strip would have worked just fine.If you are going to use that project box, why would you need the waterproof fuse panel? Seems like the existing one would work OK?
With the individual switching, I can cut off power to branch circuits independently, making sure I don't have any drains except for the refrigerator, for instance, or perhaps lighting. Not a choice I would make for a super economy build, but the extra expense of the Weatherdeck fused/switched panel was not an issue in this case since I like control options.
If I were doing more of a standard RV type build I would have just put all this stuff in a cabinet, but I really wanted (and use) a very multi-purpose van so I don't have a cabinet that gets left in place.