You'll need a casting facility that will do the two parts first. Best is a
molding machine that will squirt the bronze into a steel mold like plastics
people do. A cheaper alternative would be to do plaster molds with the lost
foam plastic process (foam casting machine to make the masters) would be
nice there but you will probably have a lot more buffing to do.
After that, buffing machines to smooth the surfaces.
Then you need to mill the hinge and then rivet in the pin.
Biggest cost item will be the molding machine.

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Why do penguins walk so far to get to their nesting grounds?