It all depends on your skill level and desire to do a project. Realistically, this car could be done right in less than three years by someone and done at a reasonable cost, IF you have the skill to do it yourself and consider the process fun.
This is not the car for someone that can only write checks or you will be really frustrated and upside down at a rate of $3-4000 per week for 52 weeks at best.
The person that buys this will have the skill to do so and will have fun doing it.
You bring up excellent points
Your skill level is worth $ multiply that times your man hours. If i had to guess you would have what ever the acquisition cost will be + $150 if not close to $200k in parts and labor.
Whats the present day value of one of these already driving, no rust ( not concourse) and reliable that you can enjoy now?
Betcha its a lots less than restoring these....
Others mention finding another donor vehicle ( body swap) or dynacorning it. Then you would not truly have a Shelby, just a stang with Shelby numbers that you transfered.
Folks everyone on this site should know better and would probably stay away from all these cars.
Those who would want you to proceed must have an interest in selling you all the needed parts or offering you their restoration services.
Unless you have a sentimental value or attachment to it, or it truly is a one of one i.e. lil red or the only 1967 convertible etc. Then and only then you take the dive and restore it any any cost.
But these are not those one of ones....time waits for no one, gota go something just bit my line....