I may have sorted it out, went over to his place at 330am this morning, all polite like, with the EPA noisy neighbors document printed out for him.
http://www.epa.vic.gov.au/our-work/publications/publication/2017/october/406-7
You may feel anxious about approaching your neighbor, but remember that they are sometimes not even aware that they are disturbing you. Talking about the noise early on can help make neighbors aware of the problem and be more considerate in future
The first part of dealing with noisy neighbors is approaching them which I did, it didn't specify a time, and 330am was a great time for me to be banging on his door. I told him, I will be available every night between 2-4am (I work in my home office during this time), and if he continues to make noise beyond 8pm, I pop over to go over the regulations with him every time it happens somewhere around 3am.
He told me he'd call the police, I said fantastic, although there is no law stopping me knocking on your door at 3am (no idea - i'll find out if he wants to fuck with me more). If there is a next time I might take the lawn mower petrol can, although this might be somewhat provocative - however if I am walking back from the servo after buying some fuel to mow the laws that day, I am sure that would make it a reasonable situation?