Most All of this is home depot mdf trim and panels. Glued mostly with zap-a-gap, but I could have used superglue, or construction adhesive. All before painting.
This was primered black with a mix of random plastic friendly spraypaints, because that's what I had. I then dry brushed some metalic that I also found in a small can at Home Depot.
The floor is granny grid which you can find at fabric and craft stores. I don't know what they call it, but it's used for macrame or crossstitch or some such.
My favorite detail here is a cast of the bottom of an oreo cookie tray... guess which one... also glued with zap-a-gap.