He has now laid out the floor of the shower with the drain placed dead center. I didn't really want the drain in the middle. I wanted it nearer the wall opposite the shower controls and not directly beneath the rain shower. But it turns out there was a floor joist directly below our chosen location and moving it a little one way or the other looked stupid to him so he just went ahead and put it in the middle. Whatever. I trust him. It will look nice. I just wish we hadn't spent quite so much time discussing drain placement if I wasn't going to have any choice at all.
And, finally, this below is the rough for the sink supply and drain. I'm okay with it. I wish we had a real plan for the bathroom, but we'll figure it out I guess... I guess.