My spreadsheet is a note book no updates for computers needed just a new pen or pencil. I just have stuff sorted by manufacture of the 1:1 for storage but the work in progress stays on the shelf in the model room. I mostly did this for trades on here and shopping at shows. Each box has a code ( F-1, BPO-1, C-1 ) with the last number changing with each box. I have the contents of each box wrote down then I know what box to look through for the kit.