@Hangmann Here is the floor plan. Maybe a brief explanation of the situation. We have a 679m² plot in a new development area with a slight slope facing west. We are slightly below a mountain peak on which a country road runs. Across the road, the mountain descends again with a beautiful nature reserve and a view of the Alps. Therefore, our "basement" with a recreation and workroom is planned in the attic to capture this beautiful view. Additionally, there is storage space and heating technology. At the same time, the fairly long house protects us from the noise of the country road (the edge of town and unfortunately popular with motorcyclists) when we sit on the terrace and enjoy the evening sun. The "technology" outside will then include something like a control cabinet, inverter, and possibly a battery storage. The granny flat will probably only be used within the family since our parents each live alone and 100km away. So it’s about a few days’ stay or perhaps later for care or for our daughter, etc. I know it’s very small but practical. The whole house is now designed to keep construction costs as low as possible (simple roof, no setbacks, and little access path) to still allow us heart’s desires like a sauna, fireplace, and bay window, even if not immediately. In addition, we want to get the maximum garden area because this is very important to us. We are absolute outdoor people, and for example, a vegetable patch and a pond are to be created. Unfortunately, no more space was feasible for us here in the region.
We actually don’t need the room labeled "Hobby/Guest". Here I would push the house 1.3m inward again. This would allow us to extend the living area into the corner and make the granny flat more versatile/larger. For this, however, we would have to move the staircase further forward and rotate it.
Here is a sketch (quickly retouched together in PPT :-)).
Regards