The thread was actually supposed to go in a different direction "floor plan," meaning room layout, but it ended up focusing more on the house geometry.
ok... usually it is kept quiet and other things are leaned on in the conversation (the actual question is avoided) when it's nonsense.
in this case, one must also say that there are still 3 unknowns here:
- the heights of the plot, which no one here can read, so does that mean a slope needs to be considered?
- must it be the curve?
- what needs must the house satisfy?
then the 4th question comes to mind:
are you actually fans of this extreme building cubature so that this effort and these costs make sense, or is it just this mentioned stubborn attitude. At least from the "designs," I can read that you have no use for it whatsoever.
in addition, the plot is quite small. I would consider creating 2 residential units on it, regardless of whether it is basement or not.
If indeed yes, then please make it age-appropriate with exits and parking spaces right away.
And with this planning (mental thing and sketch) it does not really matter where the bathroom is.
Plot size: 434m2
Slope: no (or minimal)
Site coverage ratio: 0.4
Floor space index: 0.4
If that is correct, then you are only allowed to build a total of "just" 173 sqm, not once upstairs and once downstairs.