Some careful thought needs to be had before stiring up CASA, I'm not saying don't do it but make sure RAAus has its house in order first. There's a matter of a very out-dated technical manual and lack of any formal maintainer training or assessment path to be considered. The tech manual, a legal document empowered under CAO 95.55 (for Jabiru type aircraft) says if you hold an RPC you are automatically blessed as an L1. I'd suggest this clause was written when the owner was the designer/builder/maintainer of the aircraft (95.10 style) and was appropriate for that situation. Building an airframe, then fitting a factory built engine doesn't mean you have the required skills to maintain the engine. You might be the best person to maintain the airframe, but maintenance of an engine requires a different set of skills. At present there is no way of determining whether anyone has that skill set or knowledge. CASA are already concerned about this situation, it's been an ongoing issue for many years. CASA could easily use data to relate Jabiru engine issues to untrained/assessed persons performing maintenance and subject RAAus to more grief. I'm pretty sure the engine manufacturer has been pushing this line for a while, it would be a very easy argument to build.