you must have read my mind because i really didn't describe it very well but this is almost exactly what I had in mind! I love the greyish green. I think it would look really lovely in the main bedroom as well...I love nature and this really evokes an outdoor feeling. Thank you this may well be my choice

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.

how many extra bedrooms do you need and what rooms will be downstairs and keep in mind that the stairs uses lots of space on both levels?...is a second story the only option?? .we need to see the original downstairs and a site plan to make any suggestions ?