In mother Russia, Pollang, Hungary, Bulgaria, Yugoslovia, China, and plenty of other places they would use MONSTER presses that do just what the jigs to...
If you are REALLY good you might be able to build one using a brake press but remember that you only have a small amount of metal between some of your bends and openings and the steel will try to bend where it wants which may not be where you want it to.
Also, teh vadious dimples and such would cause some issues with bending as well using a brake press but I think that is a minor concern.
Just the same, guys have built these up in lots of different ways so see what you can do... the worst is you end up with a brake press and a messed up flat.
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