Its not exactly comprehensive but here how I did it for those of you who want to give it a go.
First I taped some magnets in the correct placement onto the backside of the armor plates. They are only taped so I can remove them and mark their exact position on the backside of the armor
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Next I dressed a manikin (or in this case a brother) in the main components of the costume. Then I positioned the plates to match the costume version this will eventually be; ESB. I wanted all the unevenness and oddities to look the part.
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Then I very carefully removed the vest so that the plates would not move out of position. Right away I laid it front down on the floor.
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Last I just used a pencil to mark where the magnets are. Pop them off and you now have a marker for your 3/8th grommet hole punch!
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Thats all for now. Grommets tomorrow.