Thats a great video.
I converted one of these fridges years ago to hold 1/4 barrels. Had to do the same thing to the door, but with a lot more foam removal. I didn't have room for the CO2 tank inside so I left it outside. Drilled a hole in the side and ran both the beer and CO2 lines through, sealing with some silicone.
Insulated the beer line with foam pipe insulation and ran it about 2.5 feet to a faucet mounted through a wall, coming out next to the kitchen sink on the other side. Was a great set up.