I'm not familiar with your machine but presume it is an amateur built or ultralight ?
CASA's use of "FAR 23" in this case, I suspect, doesn't mean that the aircraft has to be designed with consideration of FAR 23 but that it has to be certificated to that Standard to be used for unrestricted operations.
If you need I can do a little research for you or else find an appropriate current name to contact in the Authority to discuss.