I agree that space between the tub/shower is weird. I think I'd opt to make the tub a drop-in or undermount vs. a stand-alone. That way you could extend the shower into the corner and put a bench there that is really a continuation of the tub deck. The glass enclosure could then separate the shower space from the open tub space. And please make sure your architect/designer centers that tub on the window. That would drive me batty. :-)

Lastly, have the toilet door open in, not out to save space. I might also add a pocket door instead of a swing door to the bath entry and make that double vanity larger to take up more of that wall.

I would put the door into the bathroom in the middle of that wall, maybe make it a pocket door and put a vanity on each side of it. I like to have totally separate vanities and it looks like you have the room for it.

Lastly, have the toilet door open in, not out to save space.

Toilets opening in can wind up being safety hazards if someone is ill in the toilet room or falls, etc.

Op, can we see how the bathroom relates to the bedroom and the rest of the space on that side of the house?

Eliminate the gas chamber, provide a 3' x 5' shower, do not make the closet directly accessible from the bathroom, allow sufficient space around a freestanding tub to clean, do not have hanging clothes turn a corner, and make sure you have sufficient counter space.

Here's another idea so while you still walk into the bathroom to get to the closet, it is easier to get to the closet if you need something without having to walk through the bathroom

Would this work? It would be really nice to do windows on three sides of the tub. Maybe top down bottom up shades with a remote.