I'm currently guesstimating ~1164' / 355m.
I missed it before but it became apparent when I tried to line up the external docking port with the internal location. I had mistakenly thought that the 3rd floor balcony lined up with the flight deck. But if you look on the film and director's cut model, the external port is higher (like a couple of feet) than the flight deck. When I drop the flight deck 2', the flight deck in the matte painting now line up better (height-wise) as well.
I'll spend some time modeling the travel pod, workbees and shuttle to see how that fits into what's been filmed for scaling...