I used 20 swg for most of the panels, I think I used 18swg for the bulkhead. This was bought from my local stockist, not sure what grade it was, just what was available. None of it is structural in a Formosa and is easy to work with compared to heavier gauges. There wasn't much choice as lock down was causing supply issues for steel, aluminium and just about everything else ! I also used aluminium rivets on this occasion.
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