This just appears to be metal embossing. Do some research on how it is done by hand. Lots of patience there.
I can see your router creating a female mold and using something like woods metal or zinc to mold up a temporary male form. Then you might be able to create a small bag press to form the sheet slathered with forming lube and hand trim or router it. .02 brass is going to take some pressure to get detail like hydroforming it. Maybe soft copper?
I've seen similar art work done with dynamite and/or exposive forming into a cavity! LOL!
If this was a production piece, chances are a pre-cut blank was done with a single sided die and a rubber pad with a large press. The alloy grade of sheet will be the the make or break in formability at reasonable pressures. Stock brass hardware sheet probably isn't going to be that cooperative! Maybe if it could be annealed?
DC
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