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yes most are aluminum but steel can be used. i've built one with 3/16 steel flanges and 18-20 gauge sheet to make the runners. yes its tedious but if your playing around there is nothing wrong with actually using steel. plus you can mig weld it, although tig works better and if really your in a bind i even saw one person braze it. he then had it powder coated and you couldn't even tell.



Absolutely no good reason that I can think of to use steel.