Wow...That's a lot of money in that car, but well spent.  Don't get rid of it.  Your best options are either to buy a semi rust free shell and fix that up until you can swap everything in or just hold onto the car until the kid gets a bit older and you have some time to work on it.  I don't know how I got into cars, my father is a mechanical moron and somehow I just happened into the Z scene and have since made it my primary hobby.  I have a kid on the way and I fully intend to continue working on the Zs until I can't lift a wrench anymore.  It's my stress reliever believe it or not.