Bloodnut I'm assuming you mean compliance under the 15 year rule.
It has to meet VicRoads rego requirements and get an engineering cert. Main thing is the side intrusion bars need to be welded in, check with engineers because when mine was done they would not sign off a cert unless they did the installation themselves. That was in NSW however, I dunno what it's like over there.
Rest of the work you can do in your sleep. Fuel filler, drivers side mirror, etc.