Looks good. I have a few questions, though. What are in the "wings" if all of the habitation is located in the central structure? Fuel? Supplies? Also, how do those "landing boats" get back to the ship (they look like just capsules to me)? Finally, would it make sense to reverse the orientation of decks 14-25 to maximize space usage (their ceilings are bigger than their floors, while the opposite it true of decks 1-12)?