Here is my tail chop I finished today. The bracket started off as a metal shelf, the aluminum was thin enough to cut using a saber saw and bend easily using a vice and hammer/hands. Only problem I have found with using the shelf is the tan color it was painted originally shows when scratched (and it scratches easy).
Here is a rough idea of what it looked like flat. If anyone wants I can make a template with measurements I just can’t find my paper with them on it now.
After cutting out the piece I put it in a vice and bent the corners (there not completely 90 degrees straight but close enough for me). Then I marked out the holes and drilled making a 5/16 hole in the appropriate spots.
Another view.
Attached to the back
Initially to chop the frame I intended to use a small pipe cutter. It ended up not working so I reluctantly turned to the hacksaw. For the plugs I found the bottom caps for chair legs worked well.
Here it is all finished (I plan to cut another piece of metal and pop rivet it to the tab that hangs down for the license plate)