I would suggest a layout that will give you only around four layouts. And name them so people know what to expect in the way of gearing and setup. Hurstville was good but boring, just like morebank, it's the same every week for years on end and you get bored with it.
if only around four track were used say one track for 2 - 3 months it would give you enough time to get a setup and track knowledge. then it changes to achive a new challange to the drivers. then just repeat the process and you will be bale to keep track records on racetimes and lap times.
It sounds great and just like the field of dreams. "Build it and they willl come".
Coxy.