The SAAA is not a regulatory authority. The airworthiness certificate with the operating limitations is issues by an Approved Person under a CASA authorisation and approved procedures manual. That makes CASA the regulatory authority.
If the conditions in the airworthiness operating limitations are breached CASA can get excited. If there is an accident then all sorts of angst will arise from many sources...CASA.Coroner.lawyers etc. ...not to mention the disrepute it brings on the rest of the amateur built movement.