[time-nuts] Homebrew primary standard?

[michael taylor]

Has there been any attempts (or successes) at someone outside of a
national laboratory, and commercial R&D groups to build a primary
frequency/time standard?

I am not sure if there is anything that would prevent an individual
from building a cesium standard of the quality seen in early models
from NPL and NIST, or an industrial style (compact Ramsey cavity)
standard.

-Michael