Handshowers that come with Roman tub faucets are not for use in a shower situation with a drop in tub. They are for cleaning the tub or rinsing shampoo out of the hair of a seated bather. If you wanted a tub/shower unit, you would have needed to have designed the installation as such from the beginning and used a tub that was designed with an integral tile flange and then used a wall mounted tub/shower type of faucet instead of a deck mounted Roman tub faucet. Those tub/shower types of whirlpools are usually designed for alcove installation where a glass door can work with them just fine. But, since you've already put in what you have, the only way to use safely such a tub as a shower without setting yourself up for a lot of water damage is to do a "ring" shower curtain like you would for the old fashioned claw foot tubs. It's basically a rectangular suspended curtain rod that you use shower curtains with. A glass door of any variety will not work in your situation, as it will not keep the water off of the tub deck and walls, which is the big danger with using a drop in tub in such a situation. The water that splashes on to the walls and deck has no way to drain back into the tub because the lip of the drop in interferes. The water has to go somewhere, and that usually is your floor or into the walls and deck surround. This makes for a nasty moldy rotten mess in a few years.

Do you use the doors at all? I would use whatever decorative draperies or other window coverings that would look nice in your room and hang an outdoor shade, remote controlled, to block the sun and/or the view. I got one of these through Costco and it is very effective at blocking the sun/heat, but filtering the light so the room doesn't look too dark. I can see out in the daytime, but if there was anyone who had a view to that window, they could see in at night (it doesn't block that). But that's what I'd use my indoor draperies for. Sun setter blinds Can you do a drapery that pulls all the way to one side on a traverse rod, or that you can pull manually if they are mounted on rings? Like this:

I would definitely cover the transom (the window above the door). You don't have a lot of wall space. If you go with curtains, I wouldn't take the rod the whole way to the ceiling (you will need a few inches of clearance for the drapes to easily open and close). Personally, I think Hunter Douglas Luminette Privacy sheers would look gorgeous on your windows. Luminette Privacy Sheers

I would hang the rod half way between the door frame and the ceiling or even higher if needed for your 108" curtain. Plan for the curtain to stack back on the right side of the door when open.