This is from a game that we're currently developing at Efecto Studios. It looks cooler when it has a weapon on top :P. The in-game material masks different areas and assign a tileable texture to every area, it also uses an aditional map for the scratches and grime.
www.playdecoherence.com
Concept Art By Alejandro Álvarez https://valhein.deviantart.com/
Decoherence - Spider Base Component