I designed as close as possible to what you illustrated because I think you have a good idea and good taste in how to realize this project.
I provide two alternative designs, which differ only in the design of the bifold barn door. because I think there needs to be air circulation in the toilet and closet so that in alternative 2 I provide a solution.
(*addition*) Because the client liked the large windows, I made the 3rd alternative design where only the windows were changed to be large in the vertical direction.
I tried to provide tiling on the wall in the necessary parts only, so that it could reduce the budget according to what was budgeted.
I prioritize keeping the closet as large as possible.
the position of the toilet that I designed prioritizes the existing floor joists
all dimensions according to what you described, I described on the floor plan in the first picture.
I hope the design that I uploaded is in accordance with what you want.