Note: I officially despise the VPK mod system compared to the old system. It's just not practical...
Navigate to: "C:\Program Files\Steam\steamapps\common\portal 2\portal2"
Drag and drop both "pak01_dir.vpk" and the "materials" folder into it.
When prompted, click "merge".
This skin (minus the base door texture) was created manually in photoshop by
Benjamin "Benjamoose" Rudman.
You may not modify or redistribute this skin without permission.
Do not redistribute = Do not upload this anywhere else.
Do not modify = Do not edit the skin.
Sorry to spell it out, but some of you still continue to upload without asking me first, claiming credit.