ORIGINAL: Jim Thomerson
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If you really want to get fancy, build up a 1/16 x 1/8 stick Warren truss framework and sheet both sides with 1/32 sheet. You will be surprised at how stiff it is.
I've built this style in a number of different dimensions from 1/2A up to .40 sized. IMHO, this construction yields the lightest and most stable structure you can build.