The tall one: three stages and a charging platform you can actually stand a figure on. It builds in stages so you can stop it short and still have a finished stack.
The furnace and the hopper line that feeds it, open at the front so figures can work the floor. The hearth lifts out, which is how you get a casualty out of it.
Two pour stations on a rail, with the ladles still hanging. The rail runs the length of the tile and keys to the next one, so the line can be as long as you own.