I enjoyed watching this presentation by one of the creators: https://www.youtube.com/watch?v=uXhELbJhgoU

However, don't see any evidence that they have physical prototypes of multi-catom swarms. Seems like they're more interested in the controls side of it, which is itself a very difficult problem.

I imagine physical constraints (such as the amount of power needed to engage the device's electromagnets) would render real constructions impossible. I'd loved to be proved wrong, though.