Finger and Toe Models have released a 28mm paper terrain Pipeline set.
From their announcement:
Finger and Toe Models announces the release of the 28mm card stock Pipeline, a standalone setting for your commandos or security troops, or it can be used to expand the Refinery. Build a complex pipe run easily because of the modular construction. Designed to be used for twentieth century through near-future engagements, Pipeline is easy to build and breaks down when you’re done. Two inch and four inch high supports couple with five different types of connectors. The pipes easily slide into the connectors and can be cut to fit as you desire. Pipeline comes with ladders, stairs, a work platform, and optional walkways that slip over the pipes. It’s a perfect set for creating a more complex setting for your industrial skirmishes.
Remember, every Finger and Toe model comes with smoosh assurance: if ya’ll smoosh your Pipeline, a new set waits your summons from hard drive and printer.