Tell me 100% that you honestly want the guy in his homebuilt Morgan aircraft (refer to previous hyperlink) with an incorrect specification oil hose from SuperCheap autos, to be flying in CTA and or over built-up areas? Who controls him maintaining his own aircraft? Nobody.
The SAAA are on the right path with this as they have mandatory maintenance classes to be able to register, operate and maintain an amateur built experimental aircraft. No such regulations exist within RAA circles. The monthly RAA magazine is littered with examples of maintenance stupidity and those are only the ones that bothered to report it.