On my schms it was a 1000 diameter but realized that was notPractical for the new world.
And yes the walls need decor if you'd like to do that.
It's not exact replica, I want elven district to be well elven. And plaza will hold guild/town halls. The palace interior was magically expanded in game so that's different. Umm statue can't be made and temple is a bit different to hold the new rank.