Hi John
Shameless plug, but what the hell!
My sig indicates my interest in the matter.
Don't forget that there is another good option in Australia for GT40s.
That is GT40 Australia, who have been building 40s continuously longer than anyone else in the Southern Hemisphere (and longer than all but 1 company in the Northern). They started building them when Denis Bedford was in charge, but now Peter Ransom is the boss. They are a little shy but there are quite a few around, in Australia, USA, and mine in the UK. They also have a good record of cars registered and being used on track, which I would suggest is a good way of indicating that the cars are robust and reliable.
They are over in Brisbane. Check them out at
DRB Sportscars Australia
All the best