Hi

About to go down the rabbit warren of replacing my gas system in my sailboat. Wondering if anyone has a copy of the standard I could borrow. I want to plan the system then have a plumber do the installation.

I have found there aren't too many plumbers around me that have in depth familiarity of the standard to be able to plan a new system.jack

Try your local library. I believe Victoria offers free read only copies of select Australian Standards.
Sean