Can you solve the door issue for Room C by making it an outswing? When open it would then be against the wall with what I assume is some kind of air return / chase. In your bathroom you might also gain some privacy for the toilet by pushing the shower up towards the closet and then putting the toilet on the shower side. Then you can put the linen closet or cabinet across from the toilet (that could also hold toilet paper for when you realize you're out ;) Would be shallower but the back of a 40" deep linen closet would probably be fairly inaccessible anyway. Would perhaps be less private when using the vanity because of the mirror, but do you generally use the toilet when someone else is in the room anyway?

I do not take baths more than once a year so I asked a realtor if a shower only master was an ok situation in my area and she said yes if I had a larger walkin shower and another tub elsewhere in the house. So I added a large jetted walk in shower only in my addition. If you love baths than I would do a small walk in shower and separate tub not a combo. Most adults do not want to climb in and out of a tub/shower combo now a days. You could also decide is closet space more important than a five piece or maybe do a single sink to gain square ft space for both a tub and shower. i would think if you change the closet to 11x8.5 and the bath to 11x13 you can get everything you want....

It would be very helpful if you'd number your choices. Are you planning on ordering the vanity online? You'll be taking your chances on color. Any painted vanity will work with the floor. I like the vanity with the bar pulls going across the three drawer fronts. That is a cool modern look. I can't tell how much grain the wood has with the dark stain though. Does it come in a double sink? I would do that with a modern mirrored medicine cabinet for your small items, like these Robern medicine cabinets. Penny tile isn't a contemporary look per se. Neither is using an accent tile in the shower. I don't think that large format tile needs an accent tile. I'd pick a 2x2 square for the shower floor.

We just stayed in a hotel that has a pocket door into the bathroom. It's horrible -- noisy, hard to pull, light and sound intrusion, etc. Do whatever you can to eliminate that. Also, think about the traffic patterns of someone having to get to the closet while someone else is at the sink, shower, or in the toilet room. Is moving the closet elsewhere an option?