I have seen one in a traner. All they did was cut out the bottom, and hinged it on one side. They then got then got a micro servo, and set it up on the side. It was connected using a torque tube. When closed, the torque tube is at about 30-45 degrees from the side, so the the door can be opened all the way to ninety degrees. Don't forget to add some reinforcement.
Hope this helps.