Thanks for the help guys. I realised I had all the parts except the airbox. And you cannot get one anywhere. I had a pod filter and heard and read varying stories as to whether they are illegal in NSW. I ended up speaking to one inspector who didn't want to answer questions but just said put everything back to stock and you'll be right. Then spoke to an inspector elsewhere and he said the issue with pod filters is induction noise, so basically so long as he could not hear it (or pretty much see it) it should be right. So I built a sheet metal enclosure for the pod filter, with one open side, and all passed.