Walls

1. Prime with Grey
2. Basecoat everything with Khaki
3. Basecoat the doors and windows with Mephiston Red
4. Basecoat metal pipes and technical bits with Gunmetal Metallic
5. Basecoat all armored conduits (vacuum cleaner hoses) with Mechanicus Standard Grey
6. Paint any cables, broken lights and broke displays with Heavy Charcoal
7. Basecoat the big boiler with Hammered Copper
8. Basecoat any plaques and icons with Bright Bronze
9. Basecoat the mechanical half of the mechanicus icon with dark Gunmetal
10. Basecoat the other half with Rakarth Flesh
11. Wash everything with Agrax Earthshade , try to avoid pooling
12. Wet the gunmetal parts with water, then apply both Rust and a bit less Dark Rust wet-in-wet
13. Basecoat the eye of the icon and any screens and lights with Corax White
14. Wash any lights with Light Tone
15. Wash the screens and the eye of the icon with Aethermatic Blue
16. Apply Nihilakh Oxide to the Bright Bronze and Hammered Copper parts
17. Drybrush main wall parts with Khaki be careful to avoid any details
18. Drybrush windowframes and doors with Mephiston Red be careful to avoid any details
19. Highlight up with basecoat colours where necessary
20. Sponge on battledamage using Charred Brown followed by fewer spots of Cold Steel focus mostly on the Khaki wall parts and their destroyed edges
21. Apply a very soft drybrush of Bone White to everything
22. Drybrush the destroyed edges with Charred Brown followed by Black

Floors

1. Prime with Gunmetal
2. Wash the underside with Strong Tone
3. Wet the underside with water, then apply both Rust and a bit less Dark Rust
4. Paint the framework on the top with Heavy Khaki
5. Wash everything with Strong Tone
6. Wet the topside with water, then apply both Rust and a bit less Dark Rust and carefully wipe away the wash from the top of the framework with a paper towel
7. Drybrush the top of the framework with Heavy Khaki be careful to avoid any details
8. Sponge on battledamage to the top of the framework using Charred Brown followed by fewer spots of Cold Steel
9. Apply a very soft drybrush of Bone White to everything
10. Drybrush the destroyed edges with Charred Brown followed by Black