Bathroom planning without much wall space - Which bathroom layout to choose?

Hello dear builders and experts,

how would you divide the space in the bathroom? The walls should also be built as little as possible. Desired is a large shower with a glass partition, a large double sink, a toilet, and a freestanding tub.

Here is the floor plan - it can no longer be changed. Many thanks in advance for your creative ideas.

What have you yourself already thought about it?

By the way, a more readable sketch wouldn't be bad either.

Edit: why can the floor plan no longer be changed? Are the walls already in place? If yes: where are the respective lines located?

By the parapet, it is meant that from a height of 1.75 m upwards there will be skylights, so there will still be a wall to reach.

tonight when I am home I will make a proper sketch with a few ideas from my side.

No, the walls are not standing yet and accordingly, there are no pipes yet, but the woman wants it that way and not otherwise.