"....How concerned should I be about the color disparity between the shower walls and floor??..." Not as concerned as I would be about the potential for those black screws (perhaps drywall) rusting in a few months time and adding some change of colour too the marble. I would also be worried that the crew did not add a poly layer behind the backer board. I'm sure the installer saved $50.00 using those screws verse the corrosive restating ones the backer board maker's specify in their install manuals. Screws look to close to the floor as well. Would I be wrong in guessing the tile crew screwed backer board to the shower curb on all three sides?

I just finished an addition to my twenties home. I tried everything to get a bath and closet with in a 13 x8 ft space but everything felt cramped and instead of having a tight closet and a tight bath with small shower and vanity we decided to add wardrobes to or large bath. I wanted custom but due to an unexpected health issue we scaled back budget and went with IKEA pax wardrobes they hold all of my most worn seasonal clothes and all of my husbands work clothes plus most worn casual wear. I like the reach in better for organization too. We still have the orginal reach in closet and a pine older armoire for extra items in the bedroom but never open it. Could you add wardrobes in the bedroom and have a nice sized bath with additional storage? I really love my large bath after years in this old house with tiny baths and closets. I was unconventional and like keeping my clothes in the bath which has two venting fans. it is my most private from the street area in my room so it is where I change anyway but the wardrobes take up so little space I could have placed them in the bedroom without losing much floor space too. in your second plan you can turn the vanity and make it longer and have the edge abut the shower with a half glass panel and than the door....

I do have a suggestion for your window, a bit pricey, but so worth it - and that is to install a window with integrated blinds, which means blinds encased between two windows. This is tremendously energy efficient and also perfect for privacy without having to add any other kind of window treatment. We did this for three master bedroom windows, based on strong recommendations from this forum, one of the best decorating decisions I ever made. The blinds never get dirty or dusty, are operated by a tiny lever in the frame (no more cord issues!), and can be adjusted any way you like - pulled up or down, opened to any degree you wish. Incredibly convenient and tidy and privacy is assured. This would be fairly easy if you are also replacing the frame. Then you could put up a café curtain on a tension rod to add some softness, which is what I have in my two bathrooms. It would fit within the frame. What do you mean by empty water space? That looks like a good place for a tall cabinet with one or two open shelves. Good for storage and/or display, even if it's small. Here is one company for blinds, there are many others!

Contractors do not design. They build. You need an actual K&B designer. You have a very restrictive space to get all that you want without turning it into a wet room. You, and your husband especially, need to educate yourself on modern waterproofing systems and how a wet room is properly created. The Schluter system will offer a lifetime warranty if their products are used from start to finish, including their thinset. Look at their YouTube channel. And don’t be so sure that your choice tractor can actually do this properly. Especially if he hasn’t had the wetroom and waterproofing conversation with you. Read below, and have a tough conversation with him on all points raised. https://www.ceramictilefoundation.org/homeowners-guide-to-hiring-qualified-tile-installer