Jw.-sounds like you are stuck on making metal tracks but I think your goal of a complete set of tracks in 1 day is unrealistic. Have you considered other options? I made rubber molds from silicone rubber and cast my track pads from epoxy. With rubber molds you can have undercuts and just peel the molds away from the part and the epoxy parts are plenty strong for a model. I cast the hinge pin holes into the parts at the perfect size but depending on your part you still may have to do machine work. This is the master part ready to mold-
This is the rubber mold-
Here is the track pads-
Track pads assembled-
Something to think about ????