You should clarify whether this 12th pipe actually needs to be executed in 100 or maybe can disappear into the wall. I still believe that you can plan a really spacious and beautiful bathroom out of 10.64 sqm, but with the W-solution a room full of compromises is created. The door to the WC just barely opens. Please imagine or check at home how you enter there and then close the door behind you. You have to watch your belly and knees, it almost collides with the toilet bowl. You could install a space-saving door but even that is a compromise. The offset for the towel warmer is also cramped and looks unattractive; moreover, the water will run out at the front, unless you remodel everything with glass, but then you would have the glass corner at the front... Please don’t misunderstand me, I’m by no means trying to badmouth your bathroom but there is simply too much in it; even a TV, as I see. I can’t imagine how all this can look stylish together. Besides, you then have 3 washbasins in the bathroom! A room within a room usually feels like an emergency solution and that will be the case here. Also terribly tight, because the dimensions of the WC room are anything but comfortable.