I have GOT to build this!
Looking forward to pictures! You probably already noticed this, but for anybody looking into this type of coop, here's something to consider.
One notable issue on the video was lack of ventilation, which you should be able to fix before building inside. They had a small fan (or heater?) on the entryway floor, but that's not really going to ventilate anything. I think if I were doing it I'd cut shallow (6-8") horizontal openings between the container ribs ( don't want to lose the structural integrity) the length of the coop area just below the roof, possibly on the side opposite the cages.) Cover the holes with 1/2" hardware cloth.
Instead of a sliding glass door I'd use wood with giant holes cut in the bottom half of both (if using wood sliding doors, or equal sized holes in front wall and door if using regular door). Cover the holes completely with 1/2" hardware cloth. Please look at Woods style coops and how they are ventilated (you can find several examples by clicking on my coop page and scrolling to the bottom. I've linked some really great Woods style coops there.
Good luck, I'm looking forward to seeing more container coops!
Chipper