This is my first one. I started with blue insulation styrofoam. I then marked and made the brick lines with a hot styrofoam cutter. Painting the floor and wall with spray paint gave the foam a concrete look. The crater was made by spraying spray paint heavy in one spot to allow the paint to eat the foam. The rock chunks are extra foam pieces.
The figures contained in the Custom Showcase are not for sale by Figure Realm, and the creators of the customs are no way affiliated with Figure Realm. The Custom Showcase is purely for entertainment purposes and only provides a means for the creators to show off their work and trade ideas. Figure Realm does not make or sell customs.