I have completed the bathroom for the ryokan. This is a very primitive bathroom, and Peggy has given a very good explanation of these toilets on her blog, so I'll let you go over there to read it, as well as see the little poster she has glued to the bathroom door showing how to use it.
The bathroom is going to be installed in this corner of the top floor hallway. The hallway isn't glued to the other rooms yet, so the bathroom is just standing where it belongs right now. I wanted to make sure I got photos before I close it all in, because you really won't be able to see much in there once everything is finished.