Good thread, kudos for doing it and especially taking photos all the way through. I Just bought a 1930s semi which Im doing some work on, so its good to see ideas

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There are some things I do find strange, especially the multiple three pin sockets in the comms cab? I would rather fit a surge protection strip, then you have an easy option of fitting a beefy UPS in the future if needed.
Also I dont think I would have run Cat6 (and do you really need so many?), to my mind cat5e would suit most situations?
I will be running some cat5e soon around my place and im genuinely interested in what you intend to use all your cat6 cables for.