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K&S is adequate (if a little expensive) for a 22" size model. The bulk of the framework would be 1/8th, the diagonals 3/32nd and the reinforcing tubes on the spine 5/32nd.
Fortunately K&S tube already comes in a nice sliding telescopic fit. If you make the framework under the passenger pod in brass then you're looking at, believe it or not, aprox 45 ft of 1/8th brass tube.