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OTOH, those 2x4 stud walls are overengineered for the gross dimensions. A stressed skin monocoque with round-cornered rectangular opening would be some fraction of the weight.
You are correct about the welding. Don't take it on the Interstate!
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.Without freedom of speech we wouldn't know who all the idiots are. -- anonymous poster
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.Necessity is the mother of invention, but simplicity is it's favorite aunt --Amish proverb
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