Re: Australian Marina's that allow liveaboard
You can live aboard at Scarborough Marina near Brisbane for a modest extra fee over the standard cost of the berth - to cover electricity & use of the hot showers etc.
Also for a much greater cost, a couple of upmarket marinas in Port Stephens allow it. For those into that sort of thing, they offer considerable luxury including sauna, internet etc. Other places exist around the Australian coast where liveaboard seems to be tolerated for extended periods. In some (e.g. Western Australia) you may have to keep a low profile because officially it is not allowed. Plenty of sailors spend quite extended time aboard while tied up to the dock and plenty more on swing moorings in places as diverse as Cairns, Hobart etc.
Even on the crowded Gold Coast there is a place colloquially known as Bum's Bay where you can spend 7 days at anchor for free, then move for a day or two to another nearby anchorage (of which there are several, though not as convenient) and return to do it all over again for another 7 days.