The Comm Base was one of the first models I worked on for Starhawk. I spent a majority of my time on the largest assets in Starhawk, and this one is one of the biggest. It was the highlight of the Starhawk demo and unveil videos, but was not intended for the final game.
The Canyon Elevator is another massive structure, it connects the ground base to a supply ship in orbit via a spine which stretches through space. In the game a large climactic battle takes place ontop of this structure based around gameplay in which the cargo (seen on the left in containers) is jetting up into space during combat.