I am completely finished! Here are some screenshots of the spawning and killing parts of the farm.
https://goo.gl/RI50yn
https://goo.gl/ZLUuuy
https://goo.gl/dFDkCK
https://goo.gl/fxdS7z
Edit: Jellyend is open too now for only half the price as DrEnderman. I'm not sure, but I think they both work equally fast if there is only one person in the end. However, if someone is at Jellyend and another is at DrEnderman, DrEnderman gets all the enderman because it's spawning area is over 2000 times that of Jellyend.
https://goo.gl/RI50yn
https://goo.gl/ZLUuuy
https://goo.gl/dFDkCK
https://goo.gl/fxdS7z
Edit: Jellyend is open too now for only half the price as DrEnderman. I'm not sure, but I think they both work equally fast if there is only one person in the end. However, if someone is at Jellyend and another is at DrEnderman, DrEnderman gets all the enderman because it's spawning area is over 2000 times that of Jellyend.
-DrBot