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All safe after earthquake. I misread your drawing. You have lots of space. I would turn the vanity so that the sinks are opposite the entry. No windows were shown, so I am assuming this is a windowless bathroom -- can you add a solartube for natural light? I am not a fan of putting the toilet in a closet -- makes me feel claustrophobic. I am attaching a proposed plan. Enclosing the toilet will make the room feel less spacious. Consider an etched glass panel to "hide" the toilet space.

We renovated recently and removed an old cast iron tub that had been reglazed badly several times - it was tough for our plumbing team to find someone to cut it up and get it down the narrow stairs.. we opted for an acrylic model for our replacement, I absolutely love old things too but definitely appreciate the new pipes that our team was able to run to the new bath as well as a nice level subfloor 😅

I think either the shower tile or the floor tile needs to be the star - having both will make it look busy. I would also would add a stained wood vanity to warm the space up a bit - but that’s just my taste - it seems a bit ”cold” to me.