It's not clear how mobile it has to be. If it's mostly going to be standing in one place, I think starting with a bus is a huge compromise.
Far better off building a trailer-able house, that way if you're going out for the day you don't have to take the whole house with you. Leaving 5+ tonnes behind is the best ecomod you can make.
You'll likely find a trailer house (or a caravan) far more comfortable to live in. Perhaps not as cool though.
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