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But needing a crew is annoying so I'll probably keep things small, something like this :
My choice too, maybe a slightly longer one to reduce fuel cost and increase range. and way more solar. I'm involved in custom build aluminum catamarans and have seen several clients move to a smaller ship so they can kick most or all crew off the ship when the owner arrives. Also quite a few that sold their house to cross the globe permanently.
Yeah the model is new but too conservative for my taste, I would throw away the diesels, just keep a small backup generator for emergencies, put more solar, windmills, hydrogenerator, and a big bank of batteries, with electric engines for maneuvering.
Do you have pictures of the custom cats ?