Bluedog, see the factory website for specs on the four different models available,,,at
http://www.gt40parts.com/
I will also send you a complete list of everything included with the kits I have on the way,(a list of what else you need to source to finish one), and the introductory pricing of the first kits. (your email is hidden so I have to send a "private message")
...as fars as comparing the NZ car with the ERA or CAV, that it best left up to you to see each type of car in person & decide which best suits your needs.
The ERA car is a "work of art" as is all of their products. Everything I have ever seen come from the ERA shop is "top notch", and incredibly accurate to the original.
The CAV car is only available as a "turnkey minus" as I understand it.....which is much like the way superformance offers their cobras. I have also seen a couple of their cars & they too are very nice.
Each manufacturer has different approaches to the same style of car, so you need to look at them all and decide what items are most important to you.
Alain