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The system's modularity is derived from the use of PALS webbing as rows of heavy-duty nylon stitched onto the vest to allow for the attachment of various MOLLE-compatible pouches and accessories.
Another idea is to bolt the mosfet to a piece of metal to cool it down instead of wrapping it in an insulator to keep it hot. And, finally, you can keep the zener diode in to protect the mosfet, but I don't think the inductive kick is going to jack the battery voltage up above the 24 volts required to destroy the mosfet.