At what point do you pull the plug?

I started searching around, would have been easier to buy a running car. As i have spent most of my time on engine and transmission and 10 hours into the body i wonder myself if it will ever get done. I cant give up. I spent my whole life fixing other peoples **** and all i ever drive is beaters.
Thousands in tools and very little return other than income.
Im getting older,and want something to show for my life’s work. If anything something i can leave behind for my son or daughter.