Thanks, but I realize it isn't very pretty (yet). "Form follows function."
Here is a thread showing my racks (the two-post is on the second page of the thread - I can't believe I was not planning on using a two-post rack at one point in my plans). The four-post is 29" deep. I was hesitant to post a pic of the rear of the open-frame 4-post rack because there is DEFINITELY a lot of cable management left to do there. At any rate, it has a lot of depth. You can see the bottom of the rack has my fax/printer/scanner. There is enough room behind it such that a Windows box easily sits there (CQC).
Regrets: Hard to know yet, I still have a lot to finish.
Before I started terminating, it looked like I had left WAY too much extra slack in the central closet (huge morass of wires). But after I started, there were multiple runs in which I wish I had left more slack.
I'm sure there will be plenty more regrets as things progress.