Originally modelled in 3ds max 2015. Final images rendered with VRay 3.2
All elements non-overlapping unwrapped. No displacement or normal map, only real geometry.

files:
MAX2015- materials:
Multi/Sub-Object;
VRayBlendMtl;
VRayMtl;
VRayLightMtl;
VRayDirt.

Other formats exported from 3ds Max 2015:
MAX2013- VRay 2.3 render.
OBJ - archive file contains 31 elements without materials with individual non-overlapping unwrapped UVs.

Models:
31 objects
dimensions: 112mm x 1491mm x 326mm
modify: TurboSmooth (on by default, Subdivision level 2)
Subdivision level 1: Polygons-373329 Vertices-186828
Subdivision level 2: Polygons-1493313 Vertices-746820

textures:
All the textures in grayscale. They are used as masks.
1 Grunge Texture (png 2048x2048),
1 mask (jpg 512x512),
1 mask (jpg 1024x1024),
12 mask (jpg 2048x2048),
1 Environment map (exr 4000x2000).