The order:
After that was clear how it looks
the sun stands nicely in the garden from midday
we went house hunting for a plot
is often chosen, but it is unnatural and disadvantageous.
If the surroundings are not taken into account when planning the floor plan, and instead of the residents' needs only superficial wishes and ideal images are used, the result is at best accidentally acceptable. In the worst case, an expensive sacred building is created to glorify one's own ideals without gaining any benefit from the extra effort or the surroundings.
You have planned your house in an imaginary environment and orientation that does not exist. From midday the sun at most illuminates your garage, but by no means the living spaces and certainly not the garden behind the opulent window fronts. This will be in the shade for most of the year, at least the first 5-7 meters from the house. The only sunbeam that reaches the house between October and April will penetrate through the smallest window in the room in the fireplace room – but only if the sun manages to get over the neighbor’s garage.
If the floor plan is really supposed to be like this, fine, but it didn’t sound like that in the first post. I would redesign the house based on the existing plot and your needs (not wishes!) taking into account the orientation and surroundings. Then a really great house for a long and varied life can be created with your means and the many usable relationships. Individual wishes can then also be implemented, but in a way that doesn’t hurt. Otherwise it’s a pity about the money.