I've had all of that stuff ever since I started putting together something that looks and works like a studio. Back in the 1970s, there were a lot of good examples of the stuff you needed. #10, the talkback speaker, caught my eye because I've always had one, Mine was a junker speaker in a plywood box, but my mic snake (which I built) had a channel for it. Interestingly, to go along with the talkback speaker was the Talkback Speaker Output on the first console that I had after graduating from an Ampex MX-10, a TASCAM Model 5. There was an IC power amplifier driving that output, just a watt or two, but loud enough and with enough distortion to grab the attention of the band in the studio. When I upgraded to the Soundcraft 600 console, it just had a line level output, so I had to put in another amplifier. I had that in the rack so I could use the same wiring as before.