Ooooh, a new puzzle! I'll start, maybe it will spark some discussion or ideas. This one makes the closet wide enough to have hangers on both sides. By keeping the small closet the same size it makes a little niche, which is just wide enough for the toilet. The window was placed directly in front of the door, not sure if that works for you or not. I have very limited ability to change appearance of things in this program, so ignore any style choices! The storage between the sinks could be shallower on top with some counter in front, but no option for me to pick that.

I've never seen a freestanding tub that wasn't trouble for showering. You are also going to be up against the fact that you won't be able to get behind the tub to clean easily or maybe not at all. If you have an alcove, IMHO an alcove or drop-in tub is a much better choice.

Thanks so much for commenting! I would love to consider a wall-mounted extension arm as an option, but I haven't been able to find one that is long enough. If you have suggestions for sourcing, please let me know. Also, we're moving to more modern-looking chrome fixtures, and the freestanding options that I'm finding are either rather Victorian or the handshowers have a shape that really is not conducive to using as an overhead shower (e.g. see attached photo for the most common modern option). If we can source an extension arm, do you think we would be able to replace the handshower with a more functional option and replace the attached tube (so it can reach the extension arm)?

Any idea how to update exterior to incorporate the addition and update the existing exterior?