We are well along on bringing the Gray Research monitor and the two surviving field sequential receivers back to life. The monitor's progress can be seen here:
http://www.earlytelevision.org/gray_restoration.html
To get these things working we have to design a signal source. We are building a color bar/gray scale generator for the old CBS standard:
http://www.earlytelevision.org/cbs_sync_generator.html
Eventually we are planning to get a 1950's CBS field sequential camera working.