I don't have an answer for Nealybug, but I'd be curious to see a picture of an instrument similar to the one that was being sold in Dec 2002. Maybe one of the people who participated in the discussion back then could source a picture.

Wikipedia item re Celestaphone https://en.wikipedia.org/wiki/Celestaphone_(instrument)

and Marxophone, with good photo (I'd like to have one of these, if it's durable!) https://en.wikipedia.org/wiki/Marxophone