Neat find Mark. Nice to see a little different take on the typical kreisel. I've done a bit of research into keeping moon jellyfish and as is usually the problem, I'd be super concerned about the small tank size. They appear to be very susceptible to salinity changes so as with the reef tanks, I personally would think bigger is better. It's a very artistic approach though. I also wish they would put a light in the bottom. Not that jellyfish need light but it seems strange to not include some kind of viewing illumination.
edit: If I had my druthers and the room/spare cash I'd get this one.
http://www.pbnjellies.com/products/cubic-pulse-160-white-jellyfish-aquarium-tank-only