Rotating Refinery (Star Wars Study)

This was an excercise done during an ILM workshop by Concept Artist Steven Zavala.
I couldn't get more than the initial models done while he was speeding through to completion, but I had a long trip home and my computer to finish it up while traveling.
I'm really glad I went.
I know I'm far from where I want to be, but the subject makes me specially like this (b'u')b