Preplaced walls are kept, i just added a gatehouse here and there and also built some walls of my own.
With some inspector gymnastics i managed to put administrative city and palace inside the small, walled area in the middle of the map. Fortunately the monument i had to build was small enough to fit in there as well.
Area inside the walls that could not get inspector coverage (due to going for Perfect Harmony) got designated to farming.
There are 3 disconnected parts of the city: northern worker block, industry + trading are and the luxury block + other worker block.
To win accept a gift of salamander that will arrive shortly.