@j-jericho They are made with individually laser cut rings of Baltic Birch plywood. The resonators are solid Walnut (not plywood). The only minor change that I'm making, is switching to more traditional corks for the cup and straight mute. The composite cork just wasn't staying on very well.
I haven't had a chance to make new videos, but here are a couple that I posted to the Facebook page. -Bob
https://fb.watch/lFE3IHxVP8/
https://fb.watch/lFE5NCAwVk/