Just finished off the scratch-built piece of terrain, long-time readers will remember this. Here's how it was built if anyone is interested. Basically a pretty simple paint job, lots of washes, drybrushing, static grass and some vallejo water effects. Tried to add the patchy, weathered rust sort of idea to it and I think it worked to an extent. Oh and of course no piece of terrain is finished without a generous dolloping of static grass. :)
What I really need to add is maybe a highlight to the water effects, and maybe use the gw ones because they don't come colour-specific (unlike this where I need to mix blue with yellow and that loses some of effect I think). Oh and the whole thing may be a bit too dark for my taste so maybe I'll drybrush some boltgun metal over the top. Still quite good for a "free" piece of terrain.