Mine only needed the child seat anchor points to be made compliant to ADR's. And a bit of surface rust treatment underneath.
According to the guys who done it, it was the only Corrado in NSW so it had to go to a weighbridge and the dimensions were recorded.
Also at the RTA the Corrado didn't show up on their system, since registering mine its now on there.

The tricky part was valueing it for customs clearance GST. It cost me a bit but could of been worse if another valuer had delt with it.

It is a tough system though, i agree on one hand that you don't want loads of ****boxes brought into the country but then again with something like the Corrado only needing child seat anchors then i don't see why an Australian citezen or resident shouldn't be allowed.

We're only talking about a minority of people wanting to do this anyway so i think they should just be strict on whats allowed in, and maybe be made compliant overseas.
The government are making plenty of $$ out of imports anyway.