I'm glad that this question came up. I've wonded the same thing myself. The answers have been interesting.
I would have to disagree with jack21 on one point. I don't think you need to have many years of car building or work to do a nice Cobra. I built my cobra a little over 2 years ago (took me 13 months) having never built an engine, car or anything like that. My auto experience had been changing
oil, plugs and tires.
I never trailer my car and drive it all over the place, took a 300 mile trip this weekend. It has won a few car shows and I think you would be hard pressed to find anyone that has seen my car that doesn't think I did a bang up job putting it together. I even built the engine....a 428 FE with 6 two barrel carbs.
All it really takes is a desire to do a good job and the help of a few car savy people to help you along the way. When you tell people you are building a cobra the car savy people seem to come out of the woodwork. At least they did in my case.
Have no plans of ever selling it.