The "Design & Building" page on my site, at
http://www.nextcraft.com/rcdesignandbuilding.html has a number of scratch building articles, including several composite-related articles, general "design concept" articles, and a CAD "tutorial" that's as generic ( for different software ) as I could make it. You're welcome to refer to any of them, if you think they would be helpful.
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Edited to correct link to Mike's new website.- bcm