No footprint. This one goes onto ground you already have — the bases key into the same 100 mm module as the terrain, so a figure stands where a tile edge says it stands instead of sliding around on top of it.
Goes with
Same line, so the same wall heights and the same keys.
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.