If your primary goal is for the front wall to be 100% glass, you can do that and still have the shower head in the middle of that glass wall. Just bring the plumbing up from the floor, or down from the ceiling, along the face of the glass. You can even have the exposed plumbing on the bathroom side of the glass wall, with it running through a hole in the glass so you can then mount the shower head inside the shower space. Do a search for "exposed shower plumbing" and you'll see some examples. You'll probably not see many on glass walls, that's not common. But when it makes sense to have exposed plumbing on a glass wall? Feel free to do it if it's your best option.

Another alternative? I've only done this a few times, but since none of your walls work out very well for a shower head, in the past I've dropped the shower head supply pipe down vertically from the ceiling with the shower head at the end of the vertical drop. It allows a shower head in the middle of the shower space, away from the walls.

I think your windows would see less water with the shower head on the front glass wall with the head pointing towards the windows than they would with the head between the windows, pointing away from the windows.

Windows in a shower? Non-wood windows perform best. But if you're stuck with wood windows, a good proper prep and top coat can help with water resistance. I'll typically use a topical membrane on the shower walls and run the membrane from the wall right on to the window jamb, sealing the membrane to the window jamb with a flexible sealant. Then tile over the membrane.

It's a unique space, good luck with your installation.

thanks for not telling me to not do it. Im making sure I get a schluter certified tile guy in and will run membrane everywhere :) Ill look into the exposed shower plumbing!

Laticrete has come out with a new system like Schluter Kerdi system.

https://laticrete.com/en/our-products/shower-installation-systems/pre-formed-shower-systems

I am installing it in a bathroom remodel. If you use the products they spec.

Laticrete will give you a lifetime warranty. It is something maybe you should look at.

With a window in the shower you definitely have to seal up to the jamb. If those are casement windows I would remove the jamb and install a solid surface material in its place. Anything to remove the wood from the shower.

If you want to mount the shower head on the glass this can be done to.

https://www.efaucets.com/nav/ct1/showersystem/0

You would have to ask your shower door company. I know that you can mount the shower column on the glass.

You can also look into and outside shower column. The plumbing can come up from the floor with do need to build a knee wall.

https://goo.gl/images/jQMvyz

I hope this helps.

Drop Joseph Corlett a line. He's The Korian King, I think he's posted a few photos over the years of trimming out windows in showers using solid surface material.

(Joe, if is wasn't you, my apologies!)

But you could line the jambs with solid surface material and seal the membrane to the solid surface.

I believe this display brings a visual to Mongos option. Just viewed this yesterday at CT Shower & Bath. I've trusted them with my glass for years.

A word of caution.

"Im making sure I get a schluter certified tile guy" There is no such thing. People that attend a 2 day seminar can say they are factory trained. They may not have installed a single piece of tile in their lives. Don't get me wrong it's a good seminar but will do nothing to validate actual experience. You want a experienced qualified tile setter.