Have you ever "simulated" this with moving boxes? In each of these planning stages, there remains at best 60cm of passage between the bathtub and the washbasin, bathtub and wall, or as an entry to the shower. In one picture, you don't even have 50cm between the edge of the bathtub and the corner niche to the shower. 50cm is half the width of a dining table... that's nothing, and at the latest when you get older, you or your guests will curse it. But well, the guest can still crawl over the wooden boards covering the bathtub.