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Part of me thinks this should be in the Computer History Museum and not in this guy's garage - simply from a preservation standpoint.
At the same time, I'm not sure if this could be considered "computer history" or not - though it certainly has elements of analog computing.
The Scanimate was one of those iconic machines that ultimately helped to lead us to where we are today with computer graphics - if this is really the only operating one in existence (I don't necessarily doubt it, from the history I have read about it and early graphics), then proper preservation should be paramount.
But I can understand if the guy didn't want to give it up.
On a side note - how many here have seen this?:
https://www.youtube.com/watch?v=Jj9pbs-jjis
Basically - computation of fractals using analog video feedback...kinda amazing that (in theory) something like could have been done in the 1950-60s using Eidophor projectors of the era (amazing analog tech in its own right)...