Hi All!
This is great stuff. For a slight twist on the technique, you might look up Bob Hunt's Lost Foam technique of building built-up wings and tails.
There is a video as well at Robins View.
http://www.airbornemedia.com/store/rv-lostfoam.htm
There is also a killer on how to mold compound curve balsa shells.
http://www.airbornemedia.com/store/rv-balsamold1.htm
Regards,
Dean Pappas.