And there was a diagram of the surface dock, the space dock’s counterpart. It was a large structure built around the base of the shaft, but while there were a lot of notes about adding admin and commercial space, there was nothing saying how far away from the main colony it had been built. (I don’t know anything about construction but I’m guessing you didn’t put your dock right in the middle of your colony in case the drop box blew up or the shaft fell over or something.)