I scratch-built this many years ago, back in my "parents' basement" days. This monolith measures 1" x 4" x 9" and is made of 0.1" sheet styrene. There are balsa wood spacers inside.

The flat-black finish got a bit scuffed over time, so a fresh paint job was in order

A fresh photo would help too.

Build your own!

Model Source(s): Lunar Models doesn't offer a monolith by itself, but does include it in some diorama kits.

My model is scratchbuilt.