I think the concept is easy enough to design yourself, but it has to be specific to your tank. The hard part that tunze developed was the fact that you can tune it to any tank given the dimensions fall within a range.
The easier way would be to trial and error on your own tank, given a powerhead and the ability to shrink / expand a box until you've gotten the perfect balance to create a nice wave motion in the tank. You'd also need a controller and a pump that can handle short spurts of on/off. Once you have that down, you'll have a wave!
I want to do some testing, then have a custom tank builder, build it into a tank.