A few quick updates.
I ended up moving my backboard from a location that was impeded by plumbing to a more accessible spot. This change does mean extending some cables, but access to my backboard panel and power will be far easier. It's a big win.
Now that my backboard has moved 8 feet away, I needed a way to drag over a dozen+ cables over 8 feet away, and most need to be extended. Extending is easy with couplers, and I figured my best solution for dealing with the extra cabling is to use a cable tray.
Cable trays are not inexpensive (they are not free), so instead I have gutted an old light fluorescent light fixture and am using the steel housing as a poor man's cable tray. I wish it were a little wider, but it works perfectly well for the 10 or so cables I have within it. Of course, this could grow.
And now for dressing cables. My technique here is to mount all the equipment and plug in the cables, and then draw them back into a neat bundle. I split the bundles into Ethernet and Coax. A lot of zip ties later and it looks good. I'm not actually planning to use the coax, but I figure that since it is throughout the building I might as well maintain it and have it look decent.