OK, for those of you who looked at the link in the OP where I got this idea from, they built a box to house their DVR and wiring in. Originally, I was just going to get some plastic storage tote or something like that. But they were either too small or too large for my liking. So I ended up building a box myself, pretty much modeled after their plans, with a couple mods.
They used guides for their sliding door covers. I assume this is because they don't have a router. I, OTOH, do have a router, so I used it for my guides instead.