Step 1 is cutting out blanks.
Step 2 is to notch the sides. They are in a fixture I made.
Drilling and locating slots.
After slotting.
My press-brake I made to rough bend them into shape.
After first form..
Then I run them through the finisher I made. No pictures of the finisher. A guy's got to have some secrets here.

Finished after running through the finisher, and drilling the rivet holes in another fixture. You can see the steps with the blank, the slotted blank, and the finished step. The finisher also puts a rib in both sides for strength Like the original.