I was wondering about this too. Lists of commodity parts might be treated like recipes, which are not subject to copyright per http://www.copyright.gov/fls/fl12

I was wondering about this too. Lists of commodity parts might be treated like recipes, which are not subject to copyright per http://www.copyright.gov/fls/fl122.html http://www.copyright.gov/fls/fl122.html, but the drawings are a different matter.