I measured, cut and bent up a piece of .020" 6061-T6 to make a stiffener for the inside top of the cargo door. Mixed up some Hysol and clamped it in place. I used angle bracket on the outside of the door to ensure straightness while the Hysol sets.
Next, I repeated the same process for the bottom stiffener. Got it Hysol'd in place and left to cure.