Anyone else here interested in, or built, or even heard Folded Well Diffusers??

I was introduced to the Folded Well Diffuser while looking around Agon, I forget who had first mentioned it, but I thought I might have a go at building some for my listening room.

RPG have submitted a patent for extended bandwidth folded well diffusers,

ReadScapes have a DIY page with many options to choose from, I went with the 40mm Prime number 7 version