Mike, I see where you are coming from on the treated wood. I have seen it twist badly so as to be unusable. A friend of mine builds a lot of stuff with it. He buys it six months in advance, trying to anticipate his needs, and stacks it under a shed in cross-hatch fashion. After a few months it becomes pretty stable, and he uses it. He says this is especially important with treated plywood. I have a couple extra treated 2x6's curing myself in case I need to replace the top boards on my external rack. I did go with steel on mine except for the top board that the inverted V is fastened to, mostly due to the large size and the weight of the roof. If not for the steel and strong rollers I obtained, I would not have started this project. Green treated wood needs to be VERY VERY well braced, and it may still warp some.
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Observing since 1966
Messier Cert #898
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