With the deck being quite narrow have you considered taking the timber to the edge of the deck and not using a coping stone. This will give you a sleeker more clean lined look. With regard 90 verses 140 decking. We use mainly 140mm now, but with the deck only being 2 metres wide this may look out of place. A lot will depend on your surroundings. If the deck hasn't been started yet I would also suggest that you run your decking the short length, this will draw your eye along the lines and give an illusion of the deck being wider than it is and looking up it not as long. With regard cupping it very much depends on the timber selected and you really need to screw down rather than nail. For almost all of our decking I specify and recommend Accoya for its stability. I am sure that it will be available in Australia.

It’s the wall colour that doesn’t look nice everything else is fine. Repaint the wall it’s easy and you want regret it , use neutral colours but not light go for darker and for the corner I would plant giant bird of paradise either in the huge pot or if possible in the ground but keep it well away from the wall to give it space to grow and give you tropical look and feel. If you are using pots you can have few of them they won’t drop leaves in the pool.

A few challenges to negotiate here, primarily safety barrier compliance - simplest way is to keep it away from the house have the pool fence lines simple & straight.....maybe consider the fire pit area with integrated built in seating closest to the house, with the pool beyond......resort feel will come from various elements, but typically lush layered planting, balanced surface treatments that respond to an external space that has been "designed" comprehensively to specific function as you would an internal space. Would be worth your while investing in some professional design (an actual architect, not just a landscaper) as these spaces need to be understood as areas to "experience" and this is what our profession specialises in achieving and helping people with....also these areas can become quite expensive so understanding budget and how to manage/distribute it is fundamental to the design decisions Best of luck Cheers PD www.pauldistefanodesign.com

I was going to suggest that the shower and hanging for togs and towels be placed in the red zone using the pool house plumbing. It looks great where you have it but it should have somewhere for the togs and towels as kids will use them several times a day in hot weather. If the Pool House was a POOL house and open to the pool would that mean you could just fence it and the pool together, but I guess by being multi function that changes the rules