This module was simpler. Some challenges in terms of having pipes aligned, and at the correct elevation, but it wasn't too bad.
Bathrooms are stacked in my building which makes it easier.
I have 2 WCs and one lavatory per restroom, with a long and thin mechanical room between the two restrooms. My pipes are all made of copper and range between 1-4" in diameter.
I implemented a grey water collection and supply system to be more sustainable.