After some critiques and studying the Eat 3D Sci-Fi Floor tutorial (thanks Mike!), here are my results.
Been working on this for the last week or so; I re-arranged/optimized UV's for higher textel density, re-did my hi-polys and bakes, and textures from scratch. It was well worth going back though.
Scene still needs some pipes and wires to decorate the walls and ceiling, as well as some dirt floor decals. Some final texture work too, like the busted grating and the ribbed tube.
C&C welcomed, thanks :)