I’ve been meaning to get around to the main door for the sim for a while. Today I finally got down to it.
The door itself is a simple construction – a small amount of framing plus the usual 6mm plywood skin. From the inside, the door is intended to resemble the existing vestibule wall; nothing unusual or fancy like portholes. From a simulated POV, the door to the sim should be at the rear (where a false door will be marked and painted for effect), whereas the actual door should be a wall. So keeping things hidden is the order of the day.