somehow, this reminds me of the choreography in the last scene of Jacques Tati's Playtime featuring cars driving in a roundabout and looking like a carousel...

The Unimat is great - I have one of those at home, and as a kid I really liked working with it. As far as I know, it is still in production:

http://www.unimat.at

I'm with Wolf (#3), the Unimat can really only be used for rather small things....