The entire interior world of my E150 van improved tremendously when I put just a three foot strip of LED tape along the section between the side wall and the ceiling. I wired for a second strip on the left-hand side but haven't bothered to put it in yet. Power comes from the rear dome light.

Oddly, I got a thumbs up and even a thanks from another installer because I used cool white instead of warm white. It happens that I'm convinced we use warm white simply out of thoughtless habit after more than a century of looking at incandescents. (Well, not me personally, but us as a group.)

The dome light is in about the dumbest position possible -- just inside the back doors at the top. Lean over from the back and the van is in shadow. The row of lights adds light, sure, but the light is not just in one position, so there's not one strong shadow.

In the referenced thread, 3PedalMini mentions cabinets that use bolts and polyurethane glue. Depending on where you're putting this cabinet, you might not need any bolts!

About ten years ago I built some cubby holes for my van. It's four cubbies wide and four cubbies high. Each cubby has a plastic toolbox in it that holds a category of stuff. Even with ten years on it, this shelf unit of 1/2" MDF held together with not a single screw, just GOOP, has never had a problem. 3/8" quarter-round molding at the edge of each cubby keeps each toolbox from sliding out. The cubby height is just what's needed for the toolbox to fit and be lifted over the molding. The entire unit has short flanges in the front and back and is screwed down to a slide-out unit that I built with about a five foot drawer. (I used bolts, screws, etc on that!)