Bathroom Planning Decision Support

As part of our house planning, we are still figuring out how to furnish our future main bathroom on the upper floor. The sloping roof with a pitch of 42 degrees and a knee wall height of 1.43 m (inside) is located on the north side and has a roof window. We need the asymmetrical hexagonal bathtub because one side slopes gently (which we want). So far, we have not been able to find a symmetrical hexagonal bathtub that offers a gently sloping side. We currently have the following options:

Option 1:

[*]Proposal from our plumbing/bath studio
[*]Advantages: relatively open and well-lit bathroom with a usable niche (for laundry basket, built-in shelves) in the northwest behind the shower
[*]Disadvantage: narrow access to the niche

Option 2:

[*]like option 2 but with the tub rotated
[*]Advantage: better access to the niche
[*]Disadvantage: the floor-to-ceiling window would have to be relocated because the tub is too close to the window

Option 3:

[*]Advantages: open layout, tub in the niche (which we would like)
[*]Disadvantage: does it seem too dark/cramped at the washbasin area because of the shower wall and despite the roof window behind?

Option 4:

[*]like option 2 but with the toilet rotated (now under the sloping roof)

Which option do you like best? I would appreciate your opinions and suggestions, possibly other proposals as well.

For me, all 5 are out, because in my opinion the washbasin is too close to the door, so the people who linger there (after all, that is the place where you can stand forever) are in the way.

Your niche would simply be a dirt trap for me, which should be avoided.
I don’t understand the thing with your asymmetrical tub: why do you want such a tub if it possibly doesn’t even exist? And if it does exist, then it will be damn expensive. By the way, most tubs slope gently on one side, that’s called ergonomics.
Take a simple rectangular one-person tub that is big enough for two, and place it with the appropriate pedestals exactly as you want it. Otherwise, there is an expensive space-saving tub from Kaldewei, 90 x 160 corner tub, oval inside, looks like an egg from above, I had one myself, but it doesn’t satisfactorily accommodate 2 people.
A floor-to-ceiling window is of course not exactly productive for a good room layout either, since you can’t place anything in front of it.
To what extent are windows and door adjustable?

The door can be moved about 20 cm to the left and nearly 60 cm to the right, as can be seen in the picture "Grundriss Bad". Unfortunately, even less can be done with the window. We would like to keep it floor-to-ceiling because of the daylight (bathroom faces east - early with the rising sun), and the exterior view hardly allows any changes or we like it as planned (see Außenansicht).

We are also not really happy with the designs. We have already pre-selected the asymmetrical bathtub (nothing signed yet) and would have swallowed the expensive pill. As already mentioned, we would prefer a symmetrical hexagonal bathtub, which apparently does not exist with the right ergonomics. A straight bathtub (e.g., 180 x 80) would fully suffice for us, even preferred over a corner bathtub. Unfortunately, only variants 3 + 4 came to mind for that. Are there any other ideas on how to move the washbasin away from directly in front of the door?

You can just tilt a normal tub. It doesn’t cost nearly as much as such a special thing. [Brüstungsfenster], which are wider for that purpose and double-leaf, let more light into the room than these narrow floor-to-ceiling ones...

Move the door maximally upwards or to the left. Try to place the shower at the bottom left in the [zu]. The door to the room then opens to the right. The shower is then basically behind the door. Next to it, place the washbasin by the window. The bathtub diagonally in the upper right corner. The toilet then on the left wall. You can also put a wall in front here if you like. I would try that.

I like option 5 best. The only disadvantage is that you have to pass by the shower first. We will probably also install the asymmetrical tub. It is "only" twice as expensive as a normal tub. But the space gain is really huge. And you can place it very differently than a normal tub. What are you using to plan the bathroom?