my suggestion are based on location of existing doors and, without moving any walls, there's just enough space to have an ens, separate dual access powder room and small wiw and biw if the master bedroom is in the smaller room and the French doors open outwards for more walking around space.. adding an internal window to the wiw will give also add light and view from the wiw

Thank you all for your replies and sorry for my late (very) reply! I'm wondering whether we could make Bed 3 the master, extend into the patio to connect Bed 3 and the Activity Room, and then turn the Activity Room into a WiR and ensuite. No idea what $ I would be looking at for that though, might be price restrictive?

You must be very happy with the end result. it's such a big job, well done and enjoy

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