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Was there an off-line follow up conversation on this thread?
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I'm going to look deeper, but ISOBlue's specs indicate their devices are only precise to 2 to 3 meters; I'm going for the sub-foot (12" - 0.3 meter) range of precision.
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Is to detect current going to the speaker (probably with a relay or SCR or somesuch) of a standard smoke alarm, and then the FIDO could send a notice out. You just have to get the voltage levels right :-)
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Finally got a custom built kernel to boot off the SD card. Its a bit awkward due to all the ssh dancing and IP address changing, but it appears to work. So, I now have a working and (I hope) stable development system. Time to take a baseline backup and start work on the device driver changes. Also have to get the debugging environment set up.
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I've assembled and tested the BeagleBone Blacks, and soldered together the XBee and GPS units for each of three base stations. The next step (and a rather big one at that) is to download all the kernel sources and find the serial device driver so I can modify it to perform very high resolution timing. Then I have to build and test, and repeat until I get it right.