Mongrel,
Welcome to the Forum. You might want to consider buying a cobra on the road as I did and then make your own changes or rebuilds as you like. It also means there are no ADR's to meet. I bought a car that didn't have all the fancy bits but was built extremely well. Some club members have got some fantastic deals by just haggling on price!!. I have now put my own individual touches on the car for minimal of cost.
I bought mine in WA (1991 RMC) for a very reasonable price and shipped it over here as part of the deal. Cost me $180 for an new windscreen, $50 for a roadworthy and transferred the car to Victoria (Rego + insurance $1000) absolutely no hassles and I can drive it now. All up around $35K. Shop around and do your homework on the different kits and if you see one on the road to buy call someone in your state cobra club to come and have a look at it with you.
Check out
www.carpoint.com.au in the used car section for AC Cobra, Cobra, and Replica. One of the dealers (ALL American) in WA has a couple of cars for sale that look OK. Good Luck!!!
Tony
Cobra Club of Victoria