Update: Well, I finished making the sheet metal brake and pressed on with fabrication of lower edges for the door shell.
Although the metal brake had some flex, it still enabled me to fabricate the two 18" door shell edges. One saving grace was the lower drain holes were not too badly rusted and served as good attachment and reference points for the new door edges.
as you can see, my MIG welding is not the best and, therefore, requires a considerable amount of grinding and "metal dressing" to get it level. The next step is to dry fit and trim the door skin. Then, I need to figure out how to create a slight indentation/body line about 1" from the bottom which matches up with the lines on the rear quarter and front fender.
Finally, yesterday, upon hearing the news that the State of Michigan is going to be reopening soon, I placed another order with Dixie Restoration Depot for the driver's side lower door skin.