You’re welcome Vanessa!
Referring to your response related to question #3, they are indeed important design features! I also recommend checking our resource on General Design Considerations & those specific to Saibai Island to see what else you can add to that.
Regarding question #2, are you pertaining to the cost of installation of greywater reuse systems?
Regarding rainwater as water source, we have included that in the background section of Design Area 2. Have a read and also do check our Interactives for more information and photos.
Regards,
Jean