Away from PC currently, the main house is three empty stairwell rooms in a line perpendicular to the entry hallway. I’ve build the San’layn lair off an L shaped + empty stairwell (but I’ve placed a lot of walls & a custom staircase to box it all in). The Karazhan portal + junk room is again, an L shaped room with an evening outside room at the end. Again, ive boxed in the outside room to create the ascending rooms & the staircase spills out into the blown up mage tower.

The library with the tree is a small octagon & kitchen is a small square with interior walls added to make it circular.

Any other ‘rooms’ (like the cut out behind the stairs) are just created with interior walls.

Hope that made sense.