Adza, what you are doing sounds more than reasonable for a local flight. I have never been ramp checked in more than 4000 hrs so I think the chances are very small. Much more likely at an airshow or fly in. Put copies of your licence and medical on your tablet. You are doing far more than most flying locally. Doing what a reasonable person would do to comply is the main thing. Just enjoy your flying, be honest if you do speak to CASA but don't volunteer more than required.