For that go take a look at Ferrous ( post ) that was also at Machina Bristronica, which is going to be far more affordable, and which you could use with your own guitar, or any other magnetic stringed instrument.
I think it’s interesting that with the Circle Guitar you can use different rings that will allow you to place the plectrums with 3/4, 4/4, or 5/4 rhythmic timings.
This instrument offers lots of options and will be very open to experimentation.