You could look a little longer for a camper MicroBus or get one of the older body-styles and 'trick it out.' Have a tent-awning that extends out the sliding door and a 'privacy' potty with solar heated, hot water bags thrown on top . . . ooohhh ladder to the 'observation deck.'
Something are so retro they come around to being cool again:
But I fully understand this is your project and you have my support. I think it is a project with considerable merit.
Bob Wilson