Deep breath!!!!! You sound like I did 3 months ago. Tile seems so permanent, it's scary. It was the only part of our new build that I changed my mind, second guessed myself over and over and over again.

Chair rail or bull nose will look great, do you know which one you prefer? Is there any particular reason the installer is pushing toward one over the other?

The 6x6 on the ceiling isn't weird in my opinion. I have a white subway shower with 4x4s set diagonally on the ceiling and I really like it. There's also some chair rail in the pic. Hope this helps!
Another thing to keep in mind is that your installer should wait until you approve everything before grouting. If you don't like something, you'll have a chance to change, reconfigure the layout, etc. Sounds like you're making nice, classic choices. Can't go wrong with that!
{{gwi:1428282}}

thanks rookie. the "tile guy" has actually been the guy at the tile store selling it to me. My GC has been...a little disturbingly hard to get dialogue going with. They havent officially started yet, so I'm hoping once they do I'll have his full attention! But I do think his current lack of communication is making me more nervous than is necessary.

Yours does look nice with the diamond ceiling, but you have that wide border and I wonder if it helps the eye transition? I'd be curious to see a picture where you're about 2 steps back so I could see the finished ends of the wall :)

My idea du jour is to use quarter round to frame the window and niche with a carerra marble sil - lets see how i feel about that by tomorrow! heh.