In the ensuite, a towel shelf above the bath taps, not too deep but could use the full width of the wall to store extra towels, bath mats etc. There looks like room above the hamper for a double towel rail (one above the other or one with two rails or double hooks instead of the single ring). May need to move the laundry hamper to the other side of the bath neary the bedroom door. WIR, suggest you just use this for hanging space and if you haven't already get a couple of good size dressers in the main bedroom that would store all your folded items - may not be any need to go to the expense of building another wardrobe. Take down the shelving racks, work out how to optimise the space available for the cloths you need to hang. Tops and pants on double rails or get some trouser racks and shoe racks, do you need much long hanging space, would you store coats in here or is there other storage elsewhere. A high shelf above the hanging could be used for out of season or special occasion clothes stored in suitable boxes. I have attached a photo of our recent custom wardrobe fit out as we don't have a walk in in this house and have had to make the best use of the space available. I measured and drew it up on graph paper first then we installed Neata and Elfa units. Still waiting on the top racks to arrive though to complete it. You will be surprised how much hanging space you can get with double rails. There are plenty of options for shoe storage racks if you want to include these in your walk in or cupboards that could be unobtrusive in your bedroom. Good luck and I hope this helps.

We have the same layout as you in our 90s spec built home. We have Bunnings type cavity sliders so I imagine ours are about as cheap as you can get. They are awful - they are noisy when they slide so if one of us gets up in the night for the bathroom, we have to open the door in slow motion so as not to wake the other one up! We have them on our other wet rooms through the house and I find them not too bad acoustically but they don't screen anything in the ensuite. I would not recommend them at all. As for whether to have 1 or 2 doors, the only time I close the WIR door is when I am at my wits end haha! It's a great space for a private phone conversation but I really couldn't be bothered closing the door any other time

I also like oklouise plan. good insulation is the key. In your original posted plan, Maybe change where the beds are positioned in the room. I think there is some bad feng shui if your head is backing onto a toilet. Apart from the noise factor, every time the toilet is flushed.

Some thoughts. If your cabinetry and bedroom colouring is warm in tone, consider how that will work with cool toned greys in the bathroom. If you can’t see the robe cabinetry at the same time as the bathroom, I would tie in with a similar texture to the robe laminate but in a lighter colour vanity, especially if the ensuite is on the smaller side.