I have a 5 year project at the moment and have just bought a 240Z project.
The way I look at it is......I have spent the money on my cars that is just investment, Selling now I will just loose money......Even if you are not interested in it now, keep it in dry storage for 20 years and work on it then when you have the time......
It sounds like it is drivable JUST ENJOY THE ZED FOR WHAT IT IS NOW....