Second sink in the island? Thats a big area to not have a sink. And a far walk from the cooktop.
Are you using 2x6 for the exterior?
What's going in the media closet?
Id think twice about the exit door in the master. I understand she may wanna feel safe from someone coming inside, but what if someone is inside, and she's in the master.
I like the powder room behind the kitchen, thats a good out of the way place to put it in case someone's gotta release the demons. I think the linen closet is a waste in the powder room. Just make the vanity bigger and scrap that.
The only thing about that entry to B3 is like if there is a TYF hangout, and Cob and his family are in Bedroom 4, and the rest of TYF is hanging out in the Great Room. I decide to take a shower because Im staying in B3, and when I get out of the shower, I gotta walk into the hallway where everyone in the Great Room can see me. Or, if I decide im gonna crash out for the night, I got mountie using the bathroom unleashing hells fury while I'm trying to sleep.