This guide may help. https://www.houzz.com/magazine/how-to-light-your-bathroom-right-stsetivw-vs~17866243

agree with the above keeping fixtures in the same position saves a lot of extra work and money, Mirrored shaving cabinets across to the shower glass panel. A narrow floating vanity with a bench top that continues across to the shower beneath the wall cabinets, should give you good storage. A new slim line toilet bowel that covers plumbing back to the wall A single glass panel for the shower space, which is now the full width of the bathroom, leaving towel rails in the same position, The window could have a plain shower curtain that pulls back to the towel rail, a water proof roller blind (which we have) or the small glass partition as suggested cheers

Alright let's see if we can put this to bed. There's nothing at all wrong or amateurish with your home. Agree seeing photo it's arguably too much of a compromise nor cost effective to move/change the window considering outcomes. The solution here will come in the fit-out and how to balance that as best as possible within the constraints set. You can do it with a 1500 size bath option, 900x1200 shower. and it's essentially a tweak/fine-tune from the idea you had originally. (I shouldn't really do this but here you go/I'm feeling generous today ;) ) You run a ledge all the way around the back and end walls. Mirrored cabinets all along the end above the basin. This will feel massive and luxurious with the ledges/more dimension & interest. But you'd need a concealed in wall cistern. Any privacy concerns (in bathrooms) can be managed by combination blinds/furnishings - arguably much more flexible (and cheaper in this situation) than changing glazing to frosted glass. And then you still retain an outlook/light to your ensuite during the day etc... Good luck & Merry Christmas :) PD

These were the bathroom layouts presented to me when we began the process 6 months ago and to be honest I didn’t really give them much thought until now. The showers are indeed too big and the vanities too small. The ensuite/WIW has changed many times however, but I still can’t get it to a point where I feel I am making best use of the space. I feel like the toilet in the ensuite might be where it is to allow for a hidden cistern? I’m happy with just a regular toilet though. Thanks for all the ideas. I will take them into consideration.