The door to prep room is always close. You can only be in delivery area and cafe. Frankly, they don't want you to be in delivery area when your car is not there. Prep room is adjacent to the delivery room. You can camp there and wait for the gate open for a quick snap shot. But, what is the big deal???
I suppose the Welt is a different. It is basically a big dealership, somewhat. You can walk around the delivery area. But, still no prep room.
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