Enderman farm design model. Has automatic enderpearl collection. Automatic enderpearl disposal when chests fill up. Sorts out items that are not enderpearls and puts them into another chest in case you accidentally throw your sharpness V diamond sword when punching the endermen. On/Off switch. Maintenance access ladder in case something needs changing, although its pretty perfect the way it is. Uses fences to stop spawning on roof so no water needed to cover the farm at the top. One hit kill. Lots of storage space.

Load the world up and follow the signs to the farm.