There are certain minimum building codes that have to be complied with in order to actually be usable. Can you post a sketch of your plan?

Sure, thanks for checking. Will have a gfci outlet by the sink, and a vapor proof vanity light. A fan and light combo will be in the bottom left corner of the room. Switches to fan and lights to be outside the room. Will wire fan and light combo to one switch so they can't have light without the fan. Planning to mount a round shower curtain rail to keep most of the splash from the rain shower off the rest of the room. This is for an Airbnb, so expecting some abuse. Found this shower door, which I know (from previous experience) creates a pretty tight seal, but will do nothing for sound: https://divided.style/products/gridscape-gs3-stand-alone-hinge-door-in-black-finish-and-satindeco-glass?variant=12193410777167. Will tile to the top of the walls but would like to avoid tiling the ceiling. Plumber told me that as long as I have a fan he doesn't think I have to.

Assuming you can having the shower plumbing on the wall with the red line, is there a reason you can't have a pocket door slide into the wall with the green line?

There is no way that anyone is gonna rent that if there’s even one pic of the wet toilet paper that’s forced on them by a RV bathroom. Find a better design. That’s not comfortable or doable.

FL Person, I can put a pocket door or even a normal door in, but I want to put a shower door in because the spray might hit the door.

live_wire_oak, Airbnb'ers have been happily renting this space for a few years now, while sharing another bathroom with others. This will be an en suite, affording the one person or couple in the bedroom an additional option. I think I'll be fine, thanks.