Butch,
You make it sound way too easy man!
It does take a lot work and it's not uncommon for people to spend months just making a plug. I want to try it myself sometime for big plane and have studied different techniques from all over the net, but it's just way to time consuming for me right now. I am however am in the process of finishing the templates of cross sections for a smaller YF-23 but even that is time consuming I have been finding. One thing I really like are composite wings like on the Roo I was flying had. I just hate the hassle of sheeting foam, glassing, sanding, more sanding, filling, more sanding etc.