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Have seen some too, but they are very heavy - the ones I’ve seen were galvanised steel pipe and not thin stuff either. Might be ok if you want to use one as a geodesic dome (add ply panels) but in making an opening for a scope the geodesic structure loses most of its rigidity and flops.
You’re beginning to remind me of another bowerbird who can’t pass an empty beercan without dragging it home to be re-purposed (on a rainy day). The snag is he never has the time.
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