I personally don't, but you could look for in your area who has a bending machine and a grille for profiles. I think it's the only solution unless you want them to build in three parts and welded... .
Well, the three welded pieces were the first solution that came to my mind.
probably also the cheapest because, true there is a handle operation, but no special machinery is required, apart from a pantograph.
Thanks for the answers, by hand I have already made the prototype, but for a construction of several pieces it is not thinkable. I would need a bordatrice but here in the area it will be difficult to find it.
Thank you.