Hello!
I have kept a log as to progress and part purchases in a word processing program, but pen and paper works too!
I've been keeping a log on my main progress since 1988, and I wished I had started earlier! Now it getting to the point where I need to replace some of these parts and I now have the part numbers I need!
I also keep reciepts, and information off the packages (a scanner is really handy for this).
Randy B.