Building a sewer table

For some reason I really like sewers and similar areas as a setting for action scenes. If I had to take I guess why, it probably has something to do with my love for the Teenage Mutant Ninja Turtles -Franchise. No matter if its in movies, tv shows, comic books or videogames, I just really enjoy the feel of those cramped spaces, small cylindrical tunnels and pipes, rivers of sludge, old brick walls and more often than not ridicolously large waterfalls into deep caverns. So when I started playing the two superhero tabletop systems by Knight Models (more on those later) I knew wanted to build a sewer-themed gaming table.