I'd recommend using pocket door hardware (Johnson HardwareŽ Pocket Door Hardware
) to connect a door to the ceiling. For the door you can use a hollow core interior door. You can secure the doors on the bottom with plastic guides mounted on the floor on the floor where the door would be in the open position. For you model the door would likely need to slide open toward the TV mounting area. As long as you have no plans to mount a TV should be no problem.