Best thing to do is see the kit brands in person. Regardless of buying new or 2nd hand. Attending a local Cobra club meeting would be very informative. Also buying Custom Kitcar magazine would be a good idea.
There are lots of options to get Cobra's built. Contact both manufacturers and 3rd party kit buiders.
It all depends on what you are looking for in a Cobra replica. Body shape & even size varies between the manufacturers, so does chassis & suspension design.
Superformance(CTC) offer a great product but ability to customise is limited. So if you want a full custom hand built Cobra, you will need to look at the local manufacturers.
Good luck with it.
