I Have done this in a 28' reefer trailer that I use as a hunting camp. I cut a house size door and two house windows in it. I put a gas wall heater in it and stays warm in -20 as long as you keep on shoe/slippers. I only put in cheep home depo rug. Floor is cold but not to bad in say 30-40 deg temps. for power I ran wires in track along base board and up to out let or lights. I turned the 45 gal fuel tank into gas storage from gen. and quads. It has worked out great with self tap screw into ribs or tie down track to put up cabnets or walls. I plan to do it again with 24' truck to go from Mexico to Alaska in two years. Good luck to you on your build.
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