This sounds like a really cool project, but I agree with folks who say it may not give you the result you want.
What I've learned in a lifetime of projects is: You never use something the way you expect to use it, so build flexibly, and do a cheap trial run first.
For example, I thought I would use my homebuilt RV the way you describe -- boondocking in the wilds and sleeping in city industrial zones. Now, in my 4th month of living in it, I find I have done very little of both! I always loved remote camping when I did it with a friend or partner, but, by myself, I find that a little woodsy RV park, or a friend's driveway in the city, is more pleasant and practical, most of the time.
So my advice is, before you spend too many years and $$$, do something temporary and take it on the road. Rent an RV, or buy a cheap old trailer, or convert a van, and get out there. See what you really end up wanting.
Also, are you thinking of traveling solo? You don't mention a wife and 6 kids. Why would you want something so big, for one person?
