I gave it a primer coat of flat black. Once dry, the whole model was drybrushed Boltgun Metal, with a follow up of silver drybrush.
Details
There are three main details I tried to pick out on the model. The first was yellow-and-black warning chevrons for ships that may be passing through the middle of the station. There were a few areas suitable for it. I used a base of Bubonic Brown, with a overcoat of yellow. I then added the black stripes.
Next, warning lights for towers and space locks were painted in maroon and green, and followed up with highlights of red and light green.
Then I added white dots all over the station, to represent the rare backlit porthole to the outside.
Finally, I gave it a coat of sealer to help survive the rigors of outer space.