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

I made some myself using 3/4'' plywood. The dividers I used 1/4'' maple ply which was lacquered on one side from factory. I've noticed the dividers have bowed and warped on me once installed. What's his name says you have to use cherry, I'm sure wood species will make a difference, I'm gonna use red oak next go around. 

I used Dennis Foley's plans and built them 9" deep. 2' by 4'   3 total placed bedind speakers. Dennis told me they probably wouldn't work in my small room 10' by 14'. He also said you have to take care of low frequencies first or your wasting your time. I have the 1/4" ply which is very good plywood used on the backs of cabinets, into a groove resting in the plywood boxes. The leading edge of said 1/4" ply has bowed and warped and has left a few small gaps in the front facing 2" wide strips. Idk if these have made an improvement in sq. I would have to remove them to really see. I would also need to build more to cover whole wall. Notice on Dennis builds they only go one direction on front wall. Rear walls and ceilings they do go in both ways. 

Why couldn't we put low freq absorption and diffusion in a wall especially if building new construction and Taylor the wall stud thickness to accommodate said building techniques? Has this been done before? So my whole wall is a huge panel!

Yes I do want to learn of the BAD diffusers. But I'm also gonna remove a wall pour a slab and extend the room by 8'. So the dimensions will be roughly 10' by  21' minus wall stud and paneling thickness. It will be another year for this construction project to begin. 
 

The ceiling is 8' with a central ac above or I would remove it too. 

Dennis quoted me 3,000 to 4,000 for his carbon technology, says it's the only thing guaranteed to work and I need a lot for my small room.