Looking good (although I'm puzzled by the fact that there seems to be no interior access from the house to this room. Maybe it just doesn't get as cold as I thought in MD.). The only thing I might have added to the project would have been some radiant to the bench seats. No one wants a chilly tush.
Oh, it gets cold in MD for sure. It'll be a chilly trip from the steam room back into the house. Fortunately there's a door into the house right next to the room.
Heated seats would be nice. The whole room should stay relatively warm in the winter (it's all within the heated envelope) and hopefully by the time the steam has been running for a few minutes, the seats will be nice and warm.