New single-family house construction without garage in self-performance

Pro family sauna

In the past, first we kids (sister, cousins, and I) were in the sauna and later the adults

The floor plan still needs some refinement. Even as a retreat, the bedroom is very large. I would really carve off a few more square meters for laundry. The laundry pile with a baby and toddler takes on gigantic proportions. Spit-up, leaked diapers, etc.

You don’t need great drawing skills for furniture. Floor plan 1:100 and 1 mm equals 10 cm furniture. Then rectangle for sofa, table, armchair, etc.
Grab your better half, roam the furniture store on Saturday, and take measurements when you’ve agreed on the XXL sofa.
Draw lots of rectangles to scale, nothing 3D, no corners just because the armchair is 10 cm narrower at the back than at the front.

Go through your house like this repeatedly.
If drawing is not your thing, then use graph paper or cardboard, cut out rectangles to scale, and lay them in the floor plans. You can also easily move them around like that.

For drawing - this also works with chalk on a large parking lot with a paved grid on Sundays. Individual rooms emerge really great and with a lot of fun.

I still see you at the very beginning with the floor plan. In my opinion, moving the stairs requires a fresh start. There is still some way to go before a successful design is achieved.

The stairs seem to me to be the central gimmick in the truest sense of the word here, probably linked to a (shared?) emotional value, something like "our song," but they dominate the current design more than one would unromantically allow. There is surely another point of reference for the "our house" feeling that does not stand so awkwardly in the design. Currently, it is a "load-bearing part" (for the failure of the design). Once a "replacement" for the stairs is found - possibly also in the form of several smaller "individuality details" - then I see the way clear to develop a more successful design.

Reality will surely catch up with you a bit. What you showed is statically very problematic, even if an architect who is actually a structural engineer says otherwise. Maybe the design will look completely different then. In 30 days of vacation and 200 overtime hours, not much has happened on the construction site. You should really bring a few thousand hours. I wish you much success, but you are underestimating the effort, which can quickly turn into frustration. Also, friends and family helping day and night is rather rare. But at least you have craftsmen at your side.

Thanks already for the good ideas, as soon as I have the new draft I will also implement your ideas and I am really curious about my results, but the staircase will definitely be smaller and not as imposing anymore
I also assume that I will lose time later on, but luckily I have to say that with a 38-hour week and home office you can find quite a bit of time for the construction, and for the rest I'm just curious
The new draft will definitely be structurally better than the current one.

I was never really aware of the sauna issue, but definitely something to consider according to your information to make it family-friendly

I am definitely looking forward to the revised draft this evening

Have you ever spoken in detail with a bank about whether they support something like this? The construction cost breakdown will be interesting.