The Industrial Terrain from GrimDark Terrain is compatible with 6-8 mm Epic Sci-Fi games. It fits perfectly into your terrain. Whether Adeptus Titanicus or other sci-fi tabletop games, it simply fits many settings.The Crodax consists of 11 parts and measures approximately 59x90x57mm. You can find assembly instructions (similar Crodax, different weapon) here:
https://grimdarkterrain.com/template-construct/stc-099-ordinatus-crodax-vulcano-escort/
We have many other terrain models and also Greebles/Bitz on offer. Just take a look around.