Sally's house
I love our huge cubby (I forgot what it's called) for soaps and shampoos. For the master, I wish we had put in two showerheads. We found lowish if not low-flow showerheads that feel like they put out a ton of water. Single handle control with two levers; one for temp that you can keep at the temp you llike and the second is the on/off. No having to adjust the temp for every shower.
Who wouldn't love this? Lots of storage and sink - make it a deep one for soaking and cleaning who-knows-what. Something else I had growing up that was used a lot for cleaning and crafts. Could remove the drawers under the machines and put the folding area on top of them if you needed to make the room smaller.
I've seen the roofing in a lot of your choices. You should find a place for it.
Q