First mains-powered project - best practices?
Not sure what the electrical standards are in Australia.

But the best practice is to always have a ground-isoloter-circuit to prevent leakage. This has become law in many countries because it prevents 70% of fires and death by electric shock.

So always ground your pretty box-like a metal shield inside it around yor syste,- Ground both sockets with a continuous ground.

Other than that I would test your product in a secure environment of a high ambient temperature for 72 hours near MAX rating to see if anything could potentially overheat and explode