This is the typical modular iron farm, just add zombies

This farm can be built module by module and by floor, with or without zombies.

If you make it without zombies, the farm only works during the day, since villagers sleep at night.

When you add a zombie per floor, the productivity is multiplied by three.

With 10 floors, in one hour without zombies, AFK, the production is approximately 3500 iron ingots, I don't like counting the flowers since if we count them, the production would be between 4500 to 5000 items per hour

With the zombie, in 10 minutes AFK I gathered 32 stacks of ingots, which gives a production of approximately 12,000 ingots, not counting the red flowers

I would like to hear your opinions after building it