The tanks, regulator, pipes and pump were painted with this technique from Brush Thralls. The only difference is I sponged on a light layer of GW Boltgun Metal as the last step.
Pump pistons were painted GW Boltgun Metal, all valve handles were painted red, and the ladder was done in wood colors. I didn't paint the CD before laying down the sand, so you could see the reflective surface even after priming. To remedy this I inked the entire base in brown. The base was then drybrushed a dark brown to a medium brown.
Small lengths of twine were cut and untwisted. They were glued along the edges of the tank with white glue. The ground cover is the standard mix. The bush is a bit of green lichen with course turf glued on. A small amount of watered down white glue was gently brushed to the course turf and some ground tea leaves sprinkled on top. The tea leaves are too much.