I know the figures, from a labour rate perspective its often more expensive manufacturing overseas than here - especially the first world countries that have car industries. Shipping is effectively free with 1,000,000 cars imported a year, it costs almost nothing to ship the cars out on those empty ships. In fact it can sometimes cost more to send a car from Adelaide to Melbourne than Adelaide to the US (depending on time of year).
Car making is capital intensive, labour rates dont come into it as much as you think. The biggest issues are economies of scale, government support and access to markets. The trick is to really pump out enough cars. For mass market cars you want your plant to be building at least 200,000 cars a year.
I think we will eventually see EV subsidies here in Australia at a federal level, but it would be good to see the state governments chip in with reduced stamp duty and registration fees (like ACT).