This is the Australian Vehicle Standards Bulletin.
https://infrastructure.gov.au/roads/.../vsb_ncop.aspx
This is the "Bible" that our vehicles must comply by.
This lists all vehicles so an engineer will be the one who advises you which parts are applicable to a passenger car build.
Depending where you are moving to (which state) the rules vary and bend a little.
Also it might be an option to look at "club rego"
Sadly tough, the fact may be that you are looking at a track only car, and may be better to finish it and sell in South Africa, or put it away and wait.
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Cruising in 5th
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Never be afraid to do something new, Remember, Amateurs built the Ark: Professionals built the Titanic.