as the ferret said bolt or rivet also steel to aluminium will cause corrosion as the two metal react with each other to form oxides you'd need to have rubber packers between the two different metals. getting a sheet of wire mesh would be the go still light and strong and can weld it to the steel 50 x 50 or 100 x 50 squares with 3 mm wire. Order from a steel merchant to cut costs like steel force onesteel vulcan or anyone else. 32 x32 x 3 shs or 40 od pipe or similar would be the size you need
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