If you are doing a "stealth" conversion, why 50 amps? don't you think the air units and heater exhausts and refer doors are going to be a give away?
On another note, if you are going to use it to break the law, how will you feel if it is impounded? How about insurance, many companies will not insure a "home conversion". If you have an accident and have lied to your insurer, good luck getting paid, or ever getting insurance again.
Just my thoughts. I have done a partial conversion on a commercial cube, and had to jump through hoops to register and insure. It was still used commercially and stayed that way. It in retrospect would have been a lot easier and cheaper to have the aftermarket maker do the work and avoid the headaches.