From the side view, you can see that I found a way to make some custom content water tanks and ladders look like the guard towers.
Back of building.
Ground floor - Kitchen, dining, and infirmary.
Second floor - available space - plus bathrooms.
Top floor - barracks and bathrooms for male and female soldiers.
Requirements: I have all the EP's and all the SP's except Glamour Life. If you use Clean Installer to install these, you may get away with not having all the Stuff Packs, but you must have Mansion and Garden.