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Re: Steel Frame?
Steel is heavy, and kind of flimsy in any thickness that's close to the weight of the aluminum you've been using. Steel is about 0.283 pounds per cubic inch, aluminum is about 0.10 pounds per cubic inch.
We've done well with pultruded fiberglass, it's about half as dense as aluminum, and the 1/4" thickness is very strong and resilient.
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