When it comes to project cars, it's like life. It's not the destination, it's the journey.
Take your time and learn asmuch as you can along the way, just follow through with your ambitions. I feel all philosophical all of a sudden.
If you are willing to tackle a project like this, then I say, best of luck. If you feel confident in your drive and patience to finish something like this then my hat off to you. I personally would love to take on a project like this. It's almost like building a car from scratch9which I've thought long and hard on), but not nearly as complicated. I recall articles in mags and on the web in which I see guys making whole body panels, from a sheet of flat metal. Wasn't there an MGB once being built and posted on the web that was in far worse condition then this mis-neglected Z. I even remember a midget that was being stretched width wise by about 5-6". Now that would be an undertaking!
It has been done before and if there is help out there, here is the place to start.
I hope you can keep this Z away from the scrap yard. We all know they are getting harder to find.