Who has a detailed file on their projects?

I document everything that happens to the car.

if I swap in an engine or major part from a parts vehicle, then I add a photo of the parts car and complete vin of the donor vehicle to the file of the car I am working on.

I try to keep track of what parts are coming from where and where they are going since I have 5 cars.

Pictures and Excel spreadsheets can paint a historical description of my cars.