More progress to report - yay! One of the jobs I've done today is filling in the stairway holes in each floor. The original design has stairs on the right wall on each level but although they make a nice feature it means that each of the right end rooms are exposed to foot traffic so it limits what they can be used for. My solution to that has been to redesign the layout, removing the stairs, patching the holes, adding an internal back wall to create a hidden backstairs void.
Other steps completed in the last couple of days are papering all the internal walls, painting the doors (all 7 of them!) and painting floors and ceilings as a temporary measure because I'm unlikely to get those surfaces lined before the weekend and the stairway hole patch doesn't look too pretty.
Not long now and the reconstruction process begins!