ᐅ Shower partition made from a material other than glass, thin and sturdy

The bathroom is very small.
However, a lot needs to fit in.
On one side of a partition for the shower, there is a washbasin mounted on the other side.

My question is about what material the partition could be made of.
What I am planning is to glue two Fermacell boards together and tile both sides.
(Just for your information: one side ends at the room wall, the other side at a stainless steel pipe that is cut open on the side. The wall won’t be very wide, about 40cm (15.7 inches).)

My question: is such a Fermacell surface stable enough?
I assume it is 😎, but I have never done this myself or heard of anyone else doing it 😱.
… or are there completely different methods that I simply haven’t come across yet?

If it is thick enough – sure. But I would recommend at least 3cm (1.2 inches) thickness. Does anything need to be attached to it, or is it purely a splash guard?

The sink (a quarter circle) is flush against the shower wall but is attached on its other side to the room wall and will probably be sealed to the shower wall with silicone only.

I don't think 30mm Fermacell exists, so I wanted to glue two panels together...

Once glued together, the panels are definitely stable enough. My only concern is that they might not be securely fixed overall. How are they attached to the floor? How are they secured to the wall? How can you ensure proper waterproofing on the shower side?

It’s better to sacrifice a few centimeters and use 50mm (2 inches) drywall studs combined with 6mm (1/4 inch) Renoboard. This way, the wall will only be about 7cm (2 3/4 inches) plus the thickness of the tiles, but it will be stable.

Then use Wedi, Ultrament, or Jackoboard. They are all the same (or at least very similar). I believe the ones mentioned above are even more suitable for wet rooms...