The Industrial Terrain from GrimDark Terrain is compatible with 6-8 mm Epic Sci-Fi games. It fits perfectly into your terrain. Whether Warhammer 40K or other sci-fi tabletop games, it simply fits many settings.The Argos Communication Bunker consists of 16 parts and measures approximately 172x172x91 mm.You can find assembly instructions here:
 https://grimdarkterrain.com/template-construct/stc-110-argos-communications-makro-bunker/
We have many other terrain models and also Greebles/Bitz on offer. Just take a look around.