I'll elaborate on the build-vs-buy. Building a kit is a non-trivial task and involves much time and also many tools that you probably don't already own, most notably the task is much easier if you have a lift. Don't build a kit thinking it will save you money - it won't. And the amount of time it takes will likely be over 1 year, probably more than two years unless you dedicate serious time to it. It's tedious and you'll spend a lot of time running around. Then you have the expense and task of integrating the power train - engine/transmission/rear end. By the time you're done you're not even paying yourself minimum wage over just buying a medium grade car that is already completed. In the end many kits get neglected and people try to sell them here after years of neglect.
Then you run the risk after completing the car that "it's not for you". They are nasty noisy hard to operate vehicles that will kill you in a heartbeat if you're not experienced at driving a short wheel base high horsepower car.
If you are thinking of a Cobra as the solution to "I want to build something" and I've heard about Cobra kits, there are much easier cars to tackle as a first project.
Part of surveying the marketplace is by looking at cars at
Cobra Country | The World's #1 Shopping Mall for Cobra Buyers & Sellers