There's some cheap LED lights installed under the cabinets, but they're wired from above. There's a hole on top of the cabinet that the wires run through, and they're plugged into an outlet inside it. If I permanently enclose it, those lights become impossible to replace without destroying the caulking when they inevitably fail in a year or so. My reasoning with stuff like this is that it's just a matter of time until someone needs to get behind there, and when that day comes they'll be thankful it's only held on by screws.

I work as a handyman and have to deal with so much inconsiderate craftsmanship from other people that I don't want to add to it myself.