OK, here your "quick decision" is coming back to haunt you: 88.5 RBM for the shower means that with cleaning and tiles you have less than 80 cm width available. Toilet where the floor-to-ceiling window is, so together with the shower where the tub is now, is too short for both at 180 cm. Have you already submitted a) a wastewater application? Because of the position of the drain? Is b) a "normal" shower with door also possible? If yes/no, then I would probably leave all positions as they are, but move the window 10 cm and give the gain to the shower. Of course, the others in the front too - for symmetry. Because I don’t see another position for the shower, every rotation has its drawbacks. It would also be nicer to be able to look through the north window when sitting on the toilet. That could still be movable. Let's see if someone else has another tip.
To be honest, I assumed that everything there was finished dimensions! Oh no!
We ourselves have not yet submitted a wastewater application. Our general contractor probably hasn’t either, since we just decided today to add an additional shower in the guest WC. According to the advisor, this was not a problem.
We would like to keep such a walk-in shower, to be honest.