I'll make the brackets myself, but need someone to form the bends in a single length of pipe / tube
I once made a roll hoop before using sand to fill the tube, then heating it 'till it was red hot, and pulled it to shape over a suitable forn (in that case, the steel rim of a Lambretta 125 LD!!!!!) It wasn't a success.......

Anyway, here's the sketch for the current plan:
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