Nothing wrong with a properly done Aluminum structure. Airplanes and large Yachts use aluminum all the time.
I suppose it depends how well done thw welding is, and the design has a lot to do with it as well.
Many Fire Trucks and Ambulances are made in Aluminum as well.
Steel is OK, but what is better, 1.5" X 1.5" .059" steel or 2" X 2" .125 wall tubing???
It all depends.
You might consider .125" plate walls instead of .062.
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