You are the man! I don't like puzzles. I am a bit on the organized side, not quite obsessive, but close. I know the cardboard trick, and use it quite a bit on small parts. On big parts I use foam board.Bag and tag the parts where they go. Cardboard helps also to push things in to keep them in a specific order. Now this is all just hearsay because I like to take my chances and strew parts everywhere like a giant puzzle. lol