RE: Grumman Widgeon
One piece of equipment athat is available is a digital scanner which stores all points on a drawing with X-Y co-ordinates. The drawing can then be replotted at any scale you desire and the line width can also be prescribed. This equipment is usually associated with engineering drawings but if you know someone in the business or are willing to pay a few bucks it might result in a superior job. How much is 30 hours worth?
Peter