Matt, I didn't use a spread sheet, but I did write out a list of what my car was equiped with when new, and the upgrades (in detail) that have been made, and or that I have done. I could send you that as an example.
Other wise, I usually try to use a some avdice an autobody shop teacher gave me. I try to work on one thing, or one section at a time from start to finish before moving onto the next. Be it body panel, or specific project like front suspension... you can apply this, and it will get you far.
Anyway, I'm sure there are some out there who do use some sort of spreadsheet?