On to the breakthrough of how to fabricate small tube: I used 4mm annealed stainless steel tube. It's very thick wall ~1mm. Comically expensive so i am looking for alternate sources. This should weld very well and not rust while i work slowly. Cuts ok with a jewler's saw or hand file, but certainly work hardens along the way.
First order of business was to add a clamp to the Dubro style bender. I 3D printed a resin block. It holds tight enough once clamped down with M3 screws.
Block installed on an aliexpress 4mm tube bender. Likely identical to the Dubro5/32" model. This allows an index point that is repeatable shown as red on the tube
Print a 1:1 scale pattern of the part to build. Use a test bend scrap bend which the index point was marked before hand. Line up the one leg and as much of the bend as possible. Mark the tube's index point onto the paper template. Repeat for all bend locations.
Transfer each index point onto the tube one at a time before each bend. Keeping everything in-plane needed a little bit more attention than i gave it.
End result is cut to length and laid over template. A little hand forming was needed to dial it in. Not bad for a first attempt. Slightly out of plane on the second bend, but workable.
This is reassuring that the tubular body that held me back for so many years can be built afterall. This is starting to light a fire so to speak.