Sorry, but whenever someone reads anything about costs in house construction here in the forum, your name always comes up, always with the same exaggerated price assumptions. In my close and wider circle, no one has had such construction costs (construction start 2024/2025). None of the general planners or prefab house providers we talked to were even close to your high costs. Maybe your hobby is to spoil other people's building projects; if it makes you happy, fine. Since I didn't ask about this here either, the impression only intensifies.
No one should claim to have a monopoly on the truth, you are right about that! In this respect, it would be more than helpful if you presented the facts you have to all the other prospective builders here, so they don't fall into the obvious price trap elsewhere; otherwise, such a discussion becomes tedious. So, the respective providers will surely be happy if you show their absolutely good offers here, and if it is indeed good, it will withstand any scrutiny and criticism. What could be better? We also didn't build a standard house, close to passive house standards and also with partly unconventional circumstances. Therefore, it is clear to me that you can also build outside of usual standards if you forgo certain things or accept their peculiarities or absence. We do that. Then I should also explain that in a discussion so that it becomes understandable and debatable. Discussing a floor plan is fun, but if the budget or the savvy planner is missing, it is a castle in the air or at the end rather wanted than able. I, and presumably others here, always appreciate extraordinary projects; however, these require more explanation than the house "Lisa" from the prefab builder. For example, we gave up on a heat pump, which saved us a lot of money, insulation was more than cheap, which is a considerable item for a passive house, windows are many but still standard quality, etc. I have written several times that with a rather extravagant build it is more important that you don't run out of breath at some point and then you afford the special staircase, stair railing, lighting, furniture, flooring, etc., because such a house with simple laminate, standard stairs, standard ceiling height, etc. would be what I consider unfinished or not well thought out. We have also had a lowered living area once, and I find that nice. But even there, additional costs arose, which I was willing to bear, and the design also becomes more extensive. Moreover, I definitely want to be able to step directly outside from there. On the other hand, I find the platform too much because it is not that big again there; furthermore, you have an area around the platform that you can virtually not use, and the purpose of that would not convince me compared to the effort and the limitations.