Stackable layer iron farm

An iron farm built around villager pods, beds and zombies, arranged so the whole structure repeats as layers. One layer runs on its own and the design is meant to be expanded by stacking more layers on top. The material list uses common early game blocks, so it suits a starter world.

• Golems can get stuck inside the blocks. One builder replaced the blocks and slabs with walls and it worked fine.
• The second layer is worth building. Golem respawn drops from about 7-20 seconds down to about 1-3 seconds.
• Several builders report only two of the four villager pods spawning golems, built exactly as shown.
• Golems spawning half in the wall and half in water, leaving them stuck in place, is also reported.
• A campfire placed on the hoppers speeds up the killing.
• Golems spawn on the ground around the finished farm unless that area is dealt with.