Sorry, my dears If one of us drafts something here, nothing is set in stone or binding. I also don't see anywhere that the staircase cannot be shifted by 20 cm. I can also move it by 50 cm; then the WC just becomes smaller, and the utility room can be shifted back up to the top of the plan. And so on. These should only be thought examples of how it _can_ be, not how it _must_ be. Least of all the dimensions. They are guideline values, nothing more. And thus the toilets should ideally be stacked, which I see here without any problem. It’s not some exotic design. But it’s slowly moving in the right direction[emoji2]