Massive steel dome structure.
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Previously:
https://www.homemadetools.net/forum/...528#post209045
https://www.homemadetools.net/forum/...360#post227972
https://www.homemadetools.net/forum/...253#post180898
https://www.homemadetools.net/forum/...615#post174337
https://www.homemadetools.net/forum/...326#post204294
