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One point: if you have to crawl behind/under/on top of a rack or three to work on something, you'll find that a paper hardcopy is far more useful than trying to drag a tablet/phone back there, or trying to contort yourself into a shape that lets you see the screen with the info on it. My routing patchbays in here were ALL worked out on paper, and once things got done, I could tack the "patchbay maps" to the wall by each bay so that the scheme could be referred to whenever needed.