Have you seen this?
http://www.feathercanoes.com/html/q&a.html

Ian

: I am starting a Wee Lassie II, the plans coming from the drawings
: in the book "featherweight BOATBUILDING" BY "Mac
: McCarthy", Sheridan Books, Ann Arbor, MI, 1996. When I
: lofted out the plans in Autosketch, I found a LOT of errors.
: When I laid out the stations on the strongback I found more
: errors. I cannot help but believe that some or most of these
: errors must have been intentional to reduce copywrite
: infringement. Do I publish the corrections on a forum like this?