Asset Overview
This farm is designed by Wattles (https://youtu.be/0L_optIDx2U). I've doubled it, and edited it to fit in my build, with help from Gnembon's video (https://youtu.be/O6q53zmCMY). Might need to change the timing on the Etho clock, and have the two zombies move together, but so far it yields about a stack of iron ingots in 15 minutes.
With the build being underwater, the iron golems will only spawn on the platforms above the villagers.