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You can use the platters as geodesic dome connector - center piece. If you glue 4x3.75" disks with crazy glue, then drill them, they will take a considerable weight. Then you come with the spokes and connect them with nuts and bolts to the disk. A very clean setup that requires no welding. Besides that, aluminum will not rust either. Use 3.5" or 3.75" disks (3.75" is better) as these are made of aluminum or aluminum alloys. The smaller ones are glass and they will shatter.