I too like the idea of keeping light from the bathroom out of the bedroom. I think your plan looks okay ( I am no expert!) I think you could add that small powder room and keep the small footprint. When you share a master bathroom with company, your bathroom and closet are on display. Also, with two doors into the bathroom, people are always locking and unlocking two doors to use the bathroom and children don;t always remember to open both doors. By taking a small space from your master closet, you could add a small powder room off the hall way. Someone else may have other ideas as to whether this will work. Pocket doors would help.

Personally, I don’t see any problem with having a walk in closet off of master bath. In fact, I like the idea... super convenient. As long as it is within your area’s building code guidelines, I don’t see why it would be an issue, or why you would feel you need validation for this idea (?). People take entire rooms of their existing houses to convert to custom closets, and most folks don’t view that as being odd. I don’t view it as being odd either, btw; and even if I did view it as being odd, it wouldn’t really be my business - since it’s not my house. As far as ‘’making things easier‘’ for your husband goes, though - I hope these extra modifications do work the way you intend, and that he doesn't just forego the closet - and throw his stuff on the bathroom floor!

You have about 10'4" between your bedroom door frame and the left exterior wall. Build your bath from the bedroom door to the exterior door along the hall and closet wall -- 10'4" long and 6' wide. Put the back of your toilet at the closet wall with its left side against that exterior wall. About one square yard would be what you'd need. From that same wall behind the closet, build a 36" dividing wall (2"x4" studs) along the right side of the toilet to create that niche for the toilet. Within that wall will be your plumbing for your tub/shower and, if you plan ahead, a shelf or two -- above and/or below that -- for a toilet tissue holder within the wall. With its faucet, shower and drain end against that dividing wall, put the left side of your tub/shower combination against that closet wall -- usually 62 ". -- and then build another 36" wall opposite the other dividing wall to frame the tub/shower. You've now used used most of that 10'4" Measure 3' from that last 36" wall to the next wall. Your door will go in that opening. Then across from that last 36" wall at the end of the tub, build a 2' wall (2"x4" studs) that will be on the right side of your 18" deep vanity/countertop with the left side of your vanity/countertop against the exterior wall. You could even hang an 18" countertop between the two walls -- exterior wall and the last 2" wall and have your vanity built only beneath where you want your sink(s), leaving plenty of room beneath the wide countertop for laundry hampers and/or roll under cabinets or a wheeled stool for sitting at the mirror. Plan ahead as you set your studs so you can build any "medicine cabinets" recessed into the wall above/behind the vanity/countertop. You could center the vanity base and sink(s) across from the tub and leave the space beneath the countertop across from the toilet open. Another option could be a sink and vanity at each end or even create a vanity beneath the entire width of the countertop. The back of the master bedroom closet(s) -- multiple closets or one elongated closet -- with bi-fold doors for access from the bedroom -- would be against the same wall as the back of the vanity -- about 10' 4" long and as deep as you need it to be: measure the heaviest coat with the widest shoulders either of you has and your closet needs to be deep enough for that coat to be hung in the closet without touching the front or back wall -- front wall with your bi-fold closet doors built in front of that between closet and bedroom. If possible, put a small window shoulder high in that exterior wall of the bath centered across from the door accessing the bath. You'd have a hallway alongside the bath and closet, not take up much more of the bedroom floor space and you could even add a door between the bedroom and the bath door in case at any time you wanted to leave the option for closing off the bedroom but not the bathroom.

15.8 feet x 20.8 feet