The scratches on the final specular map seem very artificial and arbitrary. I'd add more dirt & decay - grime in the corners, oil stains in the halls; that sort of thing. I'd also add definite indications of neglect - missing access panels, water or steam coming from patched pipes, broken or dangling lights.
The final texture is the door, the scratches are from when it slides in and out. I agree about the dirt and decay. I'll make up some decals to add some more unique detail. I'll tackle the third point next, I still need to make a set of modular pipes and wires. I'll make some alternate wall modules with missing panels.