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We (60) use 1"x2" & 2"x2" 1/8 wall 6061 Aluminum tubing
(good weld-ability / good working) with a lexsan floor pan/side panels for the main frame
alum tubing / plate for components
6061--- yield strength is 40 ksi hardness is 95 brinell
melting range is 1080f to 1205f
also heat treatable (let cool Slowly or crystallizing may occur)
SEE statement below
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watch the oz, the lbs take care of themselfs
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