URGENT!! Lid gauge: 12, 14, 16

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The plan is to have one truss in the center and a perimeter made out of 1x1. They haven't started yet and I'm not sure whether or not to go with 12 or 14 ga on the ends and 16 or 18 ga on the top. I want the struts to connect to the truss. What do you think?

go thiner, you'll hurt your back lifting that lid, or will need big time strut. Even the 1x1, with thin tube, .083. don't put to much welding or it will warp....
 

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