I have now put together the following. This time with the realistic wall thicknesses and dimensions. I have adapted the hanghaus idea a bit to my wife's wishes. Kitchen and carpenter-built-in wardrobe for the cloakroom. This is how we could imagine it well. I have only roughly placed the windows for now. Under the stairs, there would now be a mini storage/pantry. At least it looks quite tidy. We are still with a 12x9.15 m building volume.