[time-nuts] Home built cesium clocks???

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G'day fellow time-nuts.

I was just going through some old projects and found my old home-made 
mass spectrometer.  This was a project based on a design from either 
Scientific American or The Amateur Scientist back in the '60s.  I was 
wondering if anyone here had heard of a similar project for a cesium 
clock?  Although my home built mass-spec wasn't in the same league as a 
bought one, it did work and did get me a HD in physics!  How hard is it 
to make a cesium clock?  Just thinking about it and wondering what is 
actually inside the physics package.


Tim.