One other option is to fore go using hinges at all! Make the door fit snug, then apply latches to each side. This keeps the door tightly closed and as it should STAY closed. The only time the door should be opened is when your keg spits and it’s time to change it.
The CO2 and regulator MUST stay outside so you can adjust pressure. There is no need to keep the super cold liquid CO2 cold. It’s under pressure. A wired digital temp sensor is placed in the box and the display mounted outside where you can read it.