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skydancer
Clamp is a standard design (e.g. https://uk.rs-online.com/web/p/tube-clamps/4141509/ - £9 for a pack of 5 @ 38mm diameter)
Bespoke sheet metalwork - I've had some decent results from https://fractory.com/ but you'd need to have the CAD data
Hope this helps, PM me if you need more info or wish to discuss further