The Industrial Terrain from GrimDark Terrain is compatible with 6-8 mm Epic Sci-Fi games. It fits perfectly into your terrain. Whether Warhammer Adeptus Titanicus or other sci-fi tabletop games, it simply fits many settings.The Imperial Crypt Entry consists of 14 parts and measures 120x120x130mm. You can find assembly instructions here:
https://grimdarkterrain.com/template-construct/template-construct-crypt-entry/
We have many other terrain models and also Greebles/Bitz on offer. Just take a look around.