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Yes, if worse comes to absolutely horribly terrible, we might give up on the lower set of arms. Unfortunately for the metal subsitution things, the reason we used iron/steel in the first place is that it was cheaper. We probably won't be able to get more aluminum, so we very well might have to drop our arms.
On the plus side, I just got some good advice for getting materials: construction-site cleanup companies. For a school project, they may donate some of the scrap, and it's usually pre-sorted. Must inform former construction worker turned physics teacher.
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Never underestimate the power, number, or magnitude of stupid people. - me
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