Ok, I looked at Hafele. See www.hafele.com.au Look for LeMans II under corner solutions. It's hard to know if it would work and is $$ but food for thought.

@Wuff good to hear. We've settled on the stacker doors for those same reasons, for the project. Have bifolds at current house & I like them but at time of installation approx. 8 yrs ago we wanted them to fold inwards so we could screen them, oh no never heard of that, can't do that (they said). Of course now that's all possible, consequently rarely are they opened fully. At least we have a fixed/opening door on one side of the bifold set & also another single security screened door at the back of the house as a main entry point that we leave open all day.

I love the colours you suggest and they would really make the corner pop. Make it personal. Be brave. Options; Wall mounted boxes or floating shelves to display some colourful treasures above toddler height. Pinterest search 'Wall display Boxes" The next 2 sound a bit hippie but you can do them with your toddler and if they get pulled down noone gets hurt. - Fabric collage on a sore bought canvas with pieces of velvet, satin, silk in your favourite colours. Finding some vintage fabrics or op shop clothes to cut up is a cheap activity and add you can even add some bling or go with a geometric art deco style.Again Pinterest has great images. - Patchwork quilt style wall hanging eg.https://www.instagram.com/jenkingwell/?hl=en

Do you have to use the smaller front boundary for the garage? Is the noisy living space going to work with all bedrooms coming off this space? If the garage went to the south and can it be on the boundary in Sydney, that would leave the middle for bedrooms and the northern aspect for living, as most Australian houses benefit from northern light. The front setbacks would make an ideal outdoor space which high fences or high shrubs if not allowed high fences, if on a busy road most councils allow you to have sound barriers, leaving the entry to the house to come in off the long boundary, which you can make more of a feature. You have a corner block which is always a bonus. The beds will then have a quite zone, the living can have that northern end and cars can be pushed to boundary. Always look at the site before you look at plans. Always make sure the living aspect overrides the plans. Always make sure that living in a space overrides the plans, always.