This staircase was the 3rd design that got built.
Since there is no support in the middle of the stairs, each stringer (of the 2 sides) were built with 18 layers of 1/4 inches plywoods nailed and glued together. They have to be strong enough to support the entire staircase.
The wrought Iron Balusters were electroplated or powder coated in silver metal finish, they were not painted.
The home entertainment cabinet is customed built with Maple solid woods.
All the speakers are from the Electra 1027 Beryllium series by Focal JMLab.
Shown in the photo are the 2 rear speakers. The subwoofer is behind the sofa. The 2 main and center speakers are inside the cabinet.
It is kind of a shame hiding them inside the cabinet. (The reason: the cabinet was built before purchasing the speaker system)