Looking up at the finished bedroom floor...

...which utilized even the last, much narrower, bay.

After drilling the joist holes, we fished the tubing through. This view is looking from under the bedroom toward the bathroom.

There isn't much to the bathroom, since it only covers 4 joist bays. This view is looking back toward the bedroom. Looking over the floor girder, you can see the tubing runs at the edge of the bedroom. Notice that these bathroom runs don't go all the way to the back wall that will separate the bathroom from the bedroom. That area with no tubing is where the bathtub will sit.