Thanks sand, took ages, and made all textures for the rig out of lovely free ones found on the net :).
Ok here are a few texture sheets, most surfaces have diffuse, bump and reflect. Ive thrown 3 sheets together and Ill try to explain them.
Ok so this first one is the oil rigs base structure texture (sorry if there wide ><). Ok so this one covers the most surface area I think, the PSD is around 300 MB and has way over 150 layers. No surface is achieve with just one texture map, multiple rust, rivet, metal maps, some baked in corner creases, an unexplainable amount of maps using various multiply, overlay modes (soft light = the bomb). One thing people do with converting a colour map to a bump map is to simply desaturate… desaturating a colour image brings over unwanted bump levels (rust is a surface decolouration, not an indent) so for all my bumps i convert to a greyscale, then ditch all the surface colouration layers, and end up painting a majority of the chunks in, with little detail (no one wants a flickering surface due to too much bump detail). Its also the best way to get free geometry, notice the vertical beams painted up the top in my bump map, come through nicely in the latest renders… but arent geometry (the first and 3rd one).

Ok this one just shows a few random texture sheets, what Im showing isnt all my textures, i just picked a few good eons hat show off some nice texturing. Again almost all of the bump maps are generated by my painting them, especially on the buildings. I made several UWV maps for the buildings, and just randomly copied and pasted them around the buildings, so they all looked various.

Just another example of the roof texture and bump, on the right hand side is the illumination map for the building windows. Im using Vray, so this will be used for the lights to emit light based on the texture, you can see it in one of the renders, the ground and other close buildings pick up some lit up windows. Also theres the window reflect map.

Sorry with the large renders, and killing the post ><
Had to be done lol, enjoy