Welcome.I was like you when I was given the green light (wife) to start another car as it had been a few years.I found the internet and this forum to be a valuable tool.I did a ground up build and it took me about 16 mo.to complete.As Bob stated you don't have a clue as how many parts have to be engineered and assembled.The good part is most parts are available with little or no modification.The amazing thing about building your own car is there will not be another car like it because you engineered it.

Treat the father son build as something you can take to the grave, as you will never forget the ups and downs of building it and showing it off when completed.

Good Luck