I have been considering roof options for some time now, initially had hoped to work in a tower. And last night this idea came to me! If I implement this idea, by making stand alone 3 story towers on rolling bases, they would slide next to the center room, Interior doorways would match up of course, but then I would have a hallway to the back, a staircase to the 3rd floor an upstairs bathroom possibly a kitchen not sure on that. The additions would be roughly 12 inches wide and have the same depth as the center sections., the height and depth created for the 3rd floor will allow for doors in the back leading our to a terrace for each wing! When I built the peaked roof sections it left extra room on the back side of the house to do this, I just didn't know how it was going to come together.