Ha!!
The bathroom is already done I spent a lot of time looking at the angles of the 3 rooms on our 3rd floor and discovered the previous owners made completely inconsistent decisions from one room to another. Fascinating that after 5.5 years I'm only just noticing.
We have decided to give our third floor bathroom a facelift with new paint and a new vanity/mirror. But like many old house rooms, it's quirky - curved ceiling is the biggest challenge, and unusual walls (including two deep built-in shelves). I'd love to see photos of how you addressed your unusual room, if you'd like to share!!