So, here is the door hoop still attached to the form after bending.
I filled the 1″x1″ tubing with dry sand before bending it so it would not kink. The bending was done with my weight and a lot of grunting, invocation of pagan deities, and cursing in two languages. The result is a success.
Boy do I have sore arms!
There is still some spring-back. I will remove this by heating the formed tubing with a torch while it is still on the form. This will, of course, destroy the form, but who cares! Its job is over.