Mechanical bits are relatively easy and cheap. Bonnets and guards are a problem that may make or break what you do, you will need to be committed.
Have a talk to Peter Robinson, 17 Carinish Rd. Oakleigh South Victoria 3167. (03) 9544 1162.
Everyone in Australia will direct you his way. He specialises in early Corolla's having done them for more years than you can imagine, and importantly will be your best source of parts and panels.
Be VERY careful of facebook, 99% of replies you will get to wanted ads will be scammers, and everyone is after the same parts. Pete has a guy who helps him with the occasional post on his facebook page https://www.facebook.com/peterrobinsonautomotive,
But as you will see, there have been a few convincing attempts to ghost his posts.
He doesn't do email, you will need to call him.