Man plans the bathroom, can this go well?

You can see from the floor plan drawing: that the bathtub cannot be positioned diagonally on the right.

Yes, going to the right doesn’t work (well), that’s why I also had my doubts. I like your plan though and I’m considering whether a corresponding boxing in the upper left corner (possibly even angled according to the shape of the tub?) can be created for the necessary pipes and then even for the tub inlet, just a wall-mounted faucet instead of a freestanding faucet ... ?

I like it. That looks like a spa hut by the pool. Bathtub place?

No, not a spa hut (but also a good idea? With a sauna? mh)

The plan is for a movable wooden deck. The pool must absolutely be able to be securely and controllably closed (sensor contact -> smart home) (grandchildren...)

In addition, it will most likely be a (well) heated pool, and the "lid" will then also have to be well insulated like the floor and walls.

Details about the pool planning will only come next spring...

The spa hut stands on the movable pool cover and simply moves along. This saves space but no money.

Boxings of any kind would, however, impair the effect of the tub more than anything else.

Objection - an example to look up I mentioned above - [Raumfabrik], the small bathroom by interior designer Barbara Kattenbeck. A very similar task beautifully solved - with a graceful wall.