Lots of plastic sprue, insulation foam, wire mesh, necklace chain, destroyed toys and miliput.
This one has been made to look and feel like my Industrial Crane (link).
The top of the elevator tower is made with a 50:50 miliput:play doh mix and the Greenstuff World Factory Floor rolling pin (external link). Same technique as my sci-fi bases. The barbed wire is made with a 1$ wire saw from China. That one will give you around 4 metres of barbed wire.
The elevator itself is made from sprue, plastic card and wire mesh from the hardware store.
The landing pad is a serprate buiolding. The buttom of it is made from battlezone tules. The triangular pieces are made from floorboard insulation foam. Really cheap stuff, that's currogated on one side. You'll get crazy large amounts of this stuff for nothing.
Handrails are sprue, barrels are superglue lids.
9 battlezone tiles and 6 half tiles. The rest is scrap materials, used to extend it all and keep down cost.
I went with a yellow and grey paint scheme like my other industrial buildings. The stripes on the triangular bits is easy to make, as the plates are currogated when you buy them. I've build this with superglue, and some places it has melted the foam - but it's an easy cover up painted it as battle damage.
The easy extra 'cube' extension from sprue is visible here.The cheapest way to get a lot more from your battlezone tiles.
The signs add a lot of detail to a terrain build. I compiled a bunch of photos from google and printed them on to adhessive sticker. You can find the sheet of danger and warning signs here.