Time to get some terrain out of the way....
Hydra Turrets.
The concrete is standard for me: dawnstone, nuln oil and agrax washes, then drybrush dawnstone and administratum grey.
The metal was iron warriors, drybrush leadbelcher, nuln oil wash, stiple leadbelcher and then stipple iron breaker.
Then rush with washes of mournfang brown and skrag brown.
Quicker than it sounds with the washes taking far and away the longest to dry.
Also didn't glue down the turret tops so I can replace the rockets with the ray gun option when I get them painted.