No affiliation, but a bus like this would be primo
https://www.facebook.com/marketplace...8038501908741/ Sadly its the wrong side of the country from you.
A school bus is going to be very utilitarian, but that does serve as a great blank canvas. Just check your state laws regarding what color it can be as some states require you to completely repaint it. That can be quite an additional cost.
I love the idea of 4x4, but I think in practice you're going to be more limited on the size of the bus, especially the rear overhang, more than anything. Also the cost these days makes me want to cry a bit. If you really want 4x4 you might be better served to find a pop-top, extended van or look into hightop 4x4 sprinters/transits.