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

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

I think you should explore the idea of getting a Pod on the deck. its like a mini granny flat / cabana with toilet and small multi purpose room. You might have the space for this. Your layout looks fine as it is, and if you have a covered pergola, a second toilet in a pod will works well there. I am a bit against adding plumbing and moving walls to your house. First its a mess. lots of putting pipes under the flooring, fixing the flooring again, also ceiling and conrice works, and you end up with smaller bed, tighter layout. Too much sacrifice and not too much to gain.

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.