This is a really cool idea for tub/shower area in the back part of the master. The tile is a bit too wild for resale but I like the separation of the space and the glass door wouldn't be too expensive since it is a single swing door. I have used Precision glass in the past.
Tub and shower together again. Put this on the window wall like how this one is placed leave sink where it is. Put toilet across from toilet move door to where the thermostat is