you'd rather find that in student dormitories or youth hostels. And by "unique" you don't mean "beautiful" - do you?
But quite practical. No cleaning after showering. The curtain goes into the washing machine every few weeks.Yes, those things are very popular in the USA, at least if you take all the house-flipping shows as a benchmark. However, in my eyes, extremely ugly.
Search for bath tub insert or tub shower replacement, you will find a lot.There are plastic wet cells made from fibrous plastic. They are cast finished at the factory. No idea what that is called in technical jargon. Boats are also made from them. Something like that is installed in motorhomes. I have seen that once in a hotel... unique atmosphere!
That definitely did not have a silicone joint ;)
Search for bath tub insert or tub shower replacement, you'll find a lot.
Cruise ships have perfected it. Nobody wants it that small in their own home.