Video tutorial here: http://youtu.be/Buv5--gyJdQ
ask questions if stuck! its easy! pause for as long and rewind as many times as you want, the internet connection is slow, so the rush :)
or, download airfoil dwg and cut and paste.
dwgs are not readily available! png or .dat files are available easily! .dat one is also easy and more accurate method....
There has not been one dwg I wasn't able to find in the past 10 years.
I was simply offering an alternative. Your method is also correct.
i use .dat file method my self, files from UIUC database
learn and spread!