Looks interesting. I was considering going with a Cobra kit a few years back, and I came to the conclusion that with most kits, you really do get what you pay for. The Factory 5 cars are the cheapest cobra kits I've found, you can put a whole car together for 15K. They keep the price down by using a donor fox platform Mustang for sourcing alot of the mechanical pieces. However, after seeing one or two at shows, I found the proportions of the car to be a bit compromised due to this fact, which turned me off to them. I want someone to have to get on their hands and knees, under the car or in the engine bay, to tell it's a kit. Personally I like the Superformance cars the best. I ran into a guy with one at a show last summer, and the car was amazing. He went all the way, Ford 427 (a real 427, not a stroked and bored small block), you name it. It even had the correct door latches, which are sourced from a MG-T series car I believe. He bought the car turnkey, and paid alot for it, like Viper money, but in my opinion it was worth every penny. It was 100% true to the original. He parked it next to a CSX Cobra, a real one (dash signed by Shelby no less), and you could not tell the difference without getting into the nitty gritty. Thats what changed my mind about building one, I came to the conclusion that I was never going to get one that would satisfy my taste for being as authentic as possible with the money that I had available.
Best thing to do is go see the car up close for yourself. I know thats hard to do with a car built in Brazil, but they must have some way of putting potential buyers in contact with others in their country that might already own one so that they can see it. Superformance cars are built in South Africa, but they have a few distributors here in the US that you can visit to see the cars.
I've heard ERA makes a nice kit also. The ones on their website look nice but I've not seen one up close.