I was one of them once! Does Graham Berry still make the chassis for the Almac cars? I don't know if they're still making bodies.
http://www.kiwiracecars.com/ I found a body by itself over there in Auckland quite a few years back with a good shape and a 90" WB. Jacmac on CC here is a pretty clever Kiwi making his own moulds, search him out. Also check out the Almac club on here and contact a few of them. Good luck with the budget, expect to blow it.
Cheers and welcome aboard.