Propp0821 the way to get around the frieze problem is to first build the outer shell using the Wall Tool and draw it around instead of using a Room Tool. Then place your frieze. When you are adding interior rooms, again avoid the Room Tool and draw the rooms with the Wall Tool. The frieze stays where it should for me if I do that, even if I use half walls, stairs and spandrels inside. I'm also on Xbox Series X.
With the roofing problem I usually use the Half Gabled Roof or Half Hipped Roof sections rather than a full roof. I draw fences around the top of the stairs and match it with stair railings. But if you draw a full room with the half walls and wrap it around the top of the stairs it wipes out the staircase. That doesn't happen if you do the same with a fence. The fence stays invisible along the top of the stairs instead so the Sim can walk through, a half wall won't do that as it is like any other wall so you can really only use those to draw along the sides of the stairs and avoid making it into a room. It's hard to see from the images if that's what caused your issue there.
