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I looked at doing the same thing for my 10" OTA rebuild , the join needs to be welded.
I was going for a 2mm think tube.
I had lined up a machinist who specialises in aluminium work , has a tube rolling machine .... was not going to be cheap.
I eventually ditched the rolled aluminium tube idea for a plastic storm water pipe that I got as an offcut for nix (from a friendly building contractor).
You are in the UK, why don't you ask Beakon Hill or Orion if they can sell you a tube, or do what I did , ask a contractor at a building site if he has an offcut of suitable OD and length that he can spare.
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