They’re built ins that I converted.
There are 18 rows of 130HP each. The rails are just standard vector rails cut to length, but I had the mounting brackets custom made by a machine shop (which was the most expensive part).
Behind the racks are 3 Meanwell switching PSUs that put out 17A each. They are distributing the power using bus bars and heavy gauge wire which is also doubled up. Each rail is independent of each other but connects back to shared mains ground. With this set up I have no issues with noise.
What you don’t see is the rear wiring - there are balanced outs that go to a rack mounted audio interface.
I bought the house from an author so there are tons of built in shelves, one feature is there are pull out things for displaying books which are perfect for a Linnstrument, keyboard or similar.
Took me 3 months to build this!