I am just finishing a bathroom renovation, and I am thrilled with the way a floor similar to what you are considering has turned out. I used 8x8 honed bursa beige marble field tiles laid on the diagonal, with a mosaic border of polished Jerusalem gold and afyon sugar (white with some gold), and little 1x1 squares of the Jerusalem gold at every intersection of the beige tiles. When the tiles arrived there was less contrast than I expected between the border and the field tiles, and I panicked, but in fact the whole effect is quite beautiful and subtle, and the polished dots and border sparkle in the light and create some texture underfoot without making the whole of my little 5x8 bathroom look too busy. I have been trying to capture this in photos, but so far I haven't succeeded. (My walls are 4x12 white subways, and beige-colored paint above the wainscot on the toilet side of the room.) Good luck with your decision-making. I sympathize.

Some thoughts: A hot water recirculating pump is the next best thing to an electric water heater right at the faucet. I have hot water in my shower and everywhere in 6 seconds. Small expense. Saves water. Instant gratification many times a day. A shower only *needs* to be big enough for an adult to face the spray and rotate with his elbows out. People of any age benefit from a hand-hold at the spray and at the door. Shower seats are dangerous and awkward to clean. Our hand-held spray is adjustable on a vertical bar -- no additional, stationary spray. A swinging shower door is easy to wash; must be far enough from the spray not to require a side seal. Our MBA would be drafty without it's own door. Spend for a *powerful* exhaust fan. I'm glad we installed floor heat under the bathroom tile. We have two large pedestal sinks with 'laying space' on them. Two mirrored-in-and-out 'medicine' cabinets are sunk 5" into the walls above the sinks -- doors close flush with the walls. A full closet holds towels, toilet paper, bottles, soaps, cleaning supplies. There's no stooping to root through lower cabinets, and the room looks larger. I find pocket doors cumbersome for daily use. They have a less secure 'seal', and the sliding motion is unnatural for me. We have only two, on our his/hers walk-in closets, and only close them for 'company'.

I could see the advantages of the closet and the bathroom being at the one side with the remainder area for bedroom. However, that design doesn't have the same charm as closets either side of a window seat. At this point, I would work to make the addition fit the style of the existing space. For example, vintage homes pre WWII often had charming built in cupboards and wardrobes but those weren't as common in the post war cape cods and mid century ranches. Houses built in the last 40 years are likely to have walk in closets where those are rare in vintage houses. I like to see additions which match closely to the existing house and, in the best circumstances, can't be distinguished from the original portion at first glance. So, my final choice of floor plan would be greatly influenced by the age and style of the house. I don't care for putting the toilet at the end of a 5 foot tunnel; 30 to 36 inches would be quite enough. I also would not like a shower tunnel, especially one without a door. I like an enclosed shower area that I can get quite warm and not feel any drafts. In an addition of that size, I would expect a shower larger than 3 x 4 feet. At a minimum, I would be looking for 42 x 54 or 48 x 48. If the master suite has a king sized bed, I expect a king sized shower too!

congrats on getting a really good job with the penny/hex tile on your shower floor! goes astray so often, and yours looks great!