The passage is a little over 1m, so we think that's enough. Opening the bathroom door to have more space in the bathroom and that's fine. The wardrobe is 1.60 meters wide, clearly better than before. We also like the living room this way, the fireplace fits well and the room can be separated. We forwarded it to the company and are waiting for the result. The stairs will be extended towards the front door, hence also the extension of the wall, and at the top it will be pushed outward simultaneously as a roofed entrance.
Unfortunately, it could only be submitted with a photo as the PDF was too large.
I have to read the stairs description again tomorrow, I can't follow it right now... A comparison with ours, that is, one above the other, would be good.