I think that the issue boils down to the question, "So what?" If you want to restore your vehicle, and can afford the cost inch by inch, then go for it. The best thing a spreadsheet or software package can do is demonstrate for insurance reasons what you have invested. Of course, most projects far exceed the insurance value. Take time to push that value to the limit each year!!!
The real reason for restoration is to return a vehicle to new condition, and often, that cost is way beyond what one could sell it for--as if you wanted to sell your family member.
Point of post: Yes, it is good to track it, but it may not be good to know how many bux it took to do the job! Just be happy that you were able to do it!