Originally the back wall was used as CD wall in fact  , then one by one change to diffuser as you see in recent month.

I will post more pictures of the evolve.

And you're right about screen, I intend to add 175 screed over the back wall soon.

I will try to reply as many as possible since English is not my mother tongue.

Masoni , the cable elevators was custom made for Nordost Odin Speaker to fit the flat cable into the machined gap of foot cone (stainless steel)

See the new added picture of foot cone