We need a part that will add population to a ship.
My tholian space city has a crew of 1200. Which may be enough to operate the ship, But what about the 1,000,000 plus residents of these cities.
Also there should be some way to have them produce some income. Your not going to live in a space city and not pay taxes.
I put this thread in because I didn't want my suggestion to get lost in the official thread.