I was presuming for 12.01 (3), perhaps incorrectly, that CASA were going to supply a registration identification number for each registered RPA. For consistancy, surely the use of a single CASA provided registration number would be simpler than trying to work out what serial number belongs to what registered drone when being queried by authorities.
Regarding 13.01 and in keeping with overseas regulations, would it not be a good idea to display this registration number on the outside of the RPA, allowing a single registration identification mark to be used both by domestic and visiting RPAs. A registration mark including the identity of the home country (i.e VH-nnnnnnn) could then be used internationally, encouraging the global use of a single registration mark rather than having to display multiple registrations for different countries. This would result in less objections from users to having to affix multiple registrations to the outside of their RPA.