Yes, Tatjanas web page and her equipment are really impressive.
She has a a Litton LN3 up and running, too:
Tatjana van Vark ~ The Inertial Navigator Platform, videos
But the FIN101x systems are not that bad, too. The platform itself
is of a patented design (US4152942) and really a masterpiece of
mechanical design. The included computer (bit serial beast utilizing
only standard TTL chips distrubuted over several PCBs) is rather
small in size (design obviously from the 1970ties - PCs and home
computers have not been invented then) and very archaic, but
does a lot of arithmetics and spherical trigonometry!