Work has actually begun on Phase VI. I have removed the old outer wall to prepare for the new one that I have yet to design. The outer wall was very simple, as I knew it was going to get replaced when I built it. I kept the inner wall around the central part of the city, it gives it character.
I also punched a tunnel through under the castle to give more access to one of the two new areas. Its very simple so far, but I plan to design it up a little fancy.