David, did you ever use an MS-dos software package called Javelin or Javelin Plus? It was marketed as a spreadsheet competing against Lotus 123, but it was really modeling software and was unlike anything else on the market back then or now for that matter. I still have both in a box somewhere. It would be an ideal tool for what you're trying to do. Claud
Link:
http://en.wikipedia.org/wiki/J...
