3 blocks wide, 3 blocks deep, 7 blocks tall, for a slim vertical design. Liquids are held by framed glass trapdoors in schematic as they are shown in pictures. Drills and Millstones can be extended out and a belt added under the funnels to increase output. Drills, and the one funnel where bulk washing happens, are waterlogged. Ingots and blocks are created in the same basin.

I thought it would be a fun challenge to build the smallest iron farm I could, and managed to design this machine.