GP -

I like the cast concrete texture you used...hits the nail on the head. Not so sure about the item in the SW...looks like something from a Geiger universe.

The sad reality (I get to the occasional power plant) is that modern everything in an industrial environment just seems to be contained in a big grey box...SO just draw a bunch of big, grey, chamfered boxes and you wouldn't be far off

And lots of yellow/black striped caution markers (on the ground, on things that bump out, etc.)...
-Rob A>