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I selected an appropriate spot to install the switch, and dremeled a hole for it.

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Then, I added holes to mount the switch.

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Next, I located the appropriate jumpers. This varys from board to board.

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I removed them with an x-acto knife & soldering iron, and probed for the common point...

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...and installed wires to them.

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Next, I cut away part of the mainboard so the switch would fit (not a problem, since I was only cutting through the perimeter ground.

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Located / removed jumpers / soldered wires to the 2nd set of jumpers

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Next step is to replace the mainboard & connect the wires to the switch.

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Reassembled.

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If I can find a switch cover, I'll put one on, but this works just fine.