Partition for shower - How to execute?

Thank you. But actually, even with the current plan, you don’t get wet right away. That’s why the fitting is positioned a bit away. However, right opposite the entrance would be quite far away. I imagine that would be impractical if you just want to adjust the temperature or something like that.

Regarding the lighting. LED strips are to be recessed into the vertical joints at the two inner corners.
So, it is bright enough.
The concept is to be implemented like this. Except for the ceiling, which might still be moved into the outer wall or the wall by the bathtub.

It’s really just a question of how the whole thing will be executed. So, whether built with masonry or drywall and how.

I think bricking it up will simply be cheaper. The mason will finish it in an hour, the plasterer Ahmed laughs about the extra surface area, it will be tiled anyway.

Sorry, I have nothing to suggest either, but:

On the wall, as seen in the picture, the overhead shower should be installed once, and next to it the faucet with hand shower.

... the faucet should be very annoying where it is drawn.
It sticks out about 10 cm or so, so you will bump into it very often.
I would always install it on the “narrower” end wall, at least not where your own range of motion in the shower is.

We did this ourselves with 17.5 cm Ytong. Without buying anything extra for the niche. The niche was hand-cut and will later be tiled on the inside. The back wall is of course quite thin, but on our side there is a towel radiator, and you can't get to the sensitive area at all. Although nothing would happen there anyway because of the tiles.

I think such a niche is great, no idea what should bother about cleaning it. Material costs under €100.