https://www.goonhammer.com/how-to-paint-everything-boarding-actions-kill-team-gallowdark-into-the-dark-terrain

Prime

1. Prime Black Matt Black Undercoat
2. Highlight top half with Wolf Grey
3. Finish with very top Matt White Undercoat
4. Doors - spray white
5. Pillar tops - white

Metallics

1. Door metal parts gunmetal Gunmetal
2. Metallic plates with bronze Weapon Bronze
3. Wash metallics with Agrax Earthshade

Sponging

1. Sponge light gray on all wall edges and corners, including doors
2. Wear and tear dark brown on walls and doors Rhinox Hide
3. Seal with matt varnish spray Anti-Shine Matt Varnish

Oil Wash

1. Burnt Umber 50/50 with water, let dry then sponge off
2. Seal with matt varnish spray Anti-Shine Matt Varnish

Apply printed paper details - hazard strips above doors

Pigments

1. Dark brown, orange, bone pigments mixed with water. Vallejo Dust and Dirt set
2. Seal with matt varnish spray Anti-Shine Matt Varnish

Finishing Touches

1. Green screens - dark green, edges with lighter green
2. Lights - paint white, blue glow around light, then white highlight
3. Stencil in white the wall designations

Scatter Terrain