Here is a detail of the Necromunda tower depicting some of the piping. The pipes were cast from dental plaster.

Here is a detail shot of the sump area from the tower. I used some cheap water effect stuff that you are supposed to use for flower arrangements. It took 70-80 hours to dry :(

A side view of the Necromunda Underhive tower.

Here is an Underhive tower that I created this winter out of a pile of junk and some Hirstart piping.