Durango Depot Question

A manufacturer has recently produced a kit of the Durango Depot.
Photos show a few discrepencies, but the main question I have for this group involves the Train Register Room. The door to the Train Register Room is located immediately to the North of the Bay Window, and is the same as other doors except for glass in the upper panels.
Has this door always been present at this location? I learned earlier this week that the two full height windows to the south of the Bay Window were half windows in the 40's.
There have been many changes to this structure over the years, but I would guess that the Train Register Room has always been there in it's current form, and that a half window was never at the location of the door. There's that word "never" again.....
Anyone know? Thanks!