Yes, he does.
And because I managed to achieve same results with 3-ply I decided to share my success and created this topic.
The other guys here are trying to simplify my design.
And I agree with them, eg. I think the adjustable platforms for each cone separately may not be necessary, assuming you manage to have the stack of piezo-cone the same height.
Since I created this topic I use my design almost every day and it performs really good.