You are going to want more than 32" for the toilet. 36" is standard (and perhaps even code in some areas???? Not here in Maine but I heard people saying that on other forums...) We have 34" and it feels fine but I dont think I'd want to go much tighter. You could solve that simply by flipping the closet and shower. So, have your shower -rotated 90 degrees and witha glass end wall- at the end of the tub (which is a nice setup you can see in many bathrooms, the tub deck can actually protrude under the shower glass wall and be a ledge or seat in the shower). Then the passageway moves to the left, and you can steal a bit of space from the other closet for the toilet. Either that of have a shorter vanity. 48" isn't a size I'd fight for. It's too short for a double vanity, really (unless you're using one of the new two-faucet 'trough" styles) so why not go down to 42" and have a better toilet area? For resale, though, you should consider a double vanity. Some people I guess expert truly huge ones, like at least 5+' long. But you CAN get smaller ones, Ikea has some great ones for tight spaces. But if you're not selling anytime soon, do what YOU like!! (But I still think you'll want more toilet space...)

Thanks so much for your input everyone! Bevangel, special thanks to you for modifying my picture. It definitely helps to have a visual! I think moving the doors further into the hall will work, and should be very easy for the builder to do. We'd lose a little more exterior hallway space (the bedroom doors were originally at the dotted line), but having the longer hallway within the master bedroom will be more dramatic. I love this website! I'm glad I finally decided to join and stop lurking. ;)

My parents house is like that, but there’s a wall with a wide doorway into the area with the vanity, so it’s open but also easy to close off by just putting a curtain rail up. It’s also oriented to the room such that if you only use enough light at the vanity to wash your hands for a midnight potty run, it really isn’t enough to bother someone in the bed if you place the bed sensibly. Getting ready in the morning would be trickier if you needed to do makeup and so on so needed proper lighting, so that’s where a screen or a curtain would come in.

You can continue the same wood should you choose. Probably the biggest kille of wood in a bathroom is if the toilet bowl condenses, sweats and drips in the summer, or during periods of high humidity. More common in older homes or homes with no air conditioning. If you want dark wood, you can do that as well. FWIW, I have brazilian cherry in my master bedroom and bathroom. Throughout my whole house, actually. Dark wood. Looks great with no damage after 20 years. If you go with two different woods you can use a wood saddle to make the transition at the door. Or even a stone saddle. Perhaps use the same stone as your bathroom countertop if the countertop will be stone. If you use the same wood, if the strips run through the doorway a good installer can stitch the floors together, although it'd be easier to use a wood saddle at the transition. If they run parallel you can abut them with ease for a continuous look from one room into the next.