In respect of 'cabins' - and the sometimes mentioning of mining-type camps, I'd like to see the reaction of anyone going into quarantine in a 'mining style' camp! The 'dongas' are usually very small and very basic. Shared meal halls and exercise facilities.
Howard Springs was built as a first class exception, but still built as a mining camp, not a quarantine facility.
What you'd be looking at for a purpose-built 'camp' for quarantine would be a 4 or 5 star cabin-resort style thing, central kitchen, room service on demand etc. If you are going to allow people a deck or similar for outside air and exercise, then you'll have to enclose them in a high fence to stop the 'wanderers'.
Not impossible, but I think a far cry in elaborateness beyond what I think people are imagining.