David, In order to find out what IS Common Property, have a look on the Strata Plan for the area (m2) shown against the Location Plan; that’s the total strata area. Then check the Floor Plan and total the area (m2) of all 6 Lots. Subtract one from the other, and that will give you the area of the Common Property, which from what you’ve said will probably be a small area comprising the common driveway/s.
Basically, this is the Strata Scheme that Developers have when they don’t want a Strata Scheme, and in my opinion at least it’s probably more trouble that it’s worth when Owners have to work out who’s responsible for what and what the cost apportionments should be when shared areas such as the roof and adjoining walls require maintenance / repairs.
At least Owners’ Strata Levies and the Owners Corporation’s Insurance Premium would be low 
Seriously though, might I suggest that you you contact a Plan Examiner at NSW Land & Property Information, and ask them to expertly interpret the Strata Plan for you.
I’d be interested to know the outcome.