Domenic:
All the above posts are very helpful to the cost. You last reference trying to convince your dad that you are not crazy. Goodluck. I have told million and millions of people (maybe stretching the truth there) that I was building a car. Only 1, only 1 started to more excited than me and it turns out that is because he had built an MG kit about 20 years ago. He immediately took me to his garage to show it to me. A very nice car he built by the way.
Most of the people I have told have taken me off address list, emails and phone directories. I didn't get any Christmas cards this yer form have of them.
Advice on how to convince your father:
Stay away from practical things like. I can use it all year round (depending on where you live). I can take all my stuff to college in it. It won't cast more a Chevy Malibu to insure.
You need to stick to things like -- it will help in my next career to be a mechanic, body repair, painter. Or how it will help in your future years. Convince him that if you start now that you will be the most knowledgable ClubCobra member 40 years from now when all the current members can't remember there names much less log into the board