Sorry, guys. But these sketches here won't get you anywhere. 45° roof slope with knee wall 0. That's relatively simple - dwarf wall at 1m height also with 1m depth in the house. But! Measurements are of course taken from the interior wall. And now please draw the 2m line. Doors, shower, tall cabinets below the 2m line all not possible. And the stairwell must be measured exactly, because the stairs will mercilessly come up exactly where the opening ends, no matter how you turn them, and nowhere else.
Which makes me question your measurements right away. The measurements in depth are approximately correct. I had also estimated 2.84m from the front door. But the location measurements in width are somehow nonsense. You can nicely read those on the dimensioned floor plan. The stairs are against the wall at 4.605m measured from the very outside.
In my opinion, the most elegant solution would still be to have the pipes newly planned upwards. You're still in the shell construction phase, right? That can be done. Drainage via the utility room. I would have that checked.
Here's your plan with approximately correct measurements:
As you can see, nothing more works with a bedroom. Even the child's bed in the room on the left side of the plan is hardly possible with a 1m dwarf wall because you can't stand beside it on 60cm without holding your breath. And I only have a 1m corridor upstairs - that's already below the puke limit.
