Endermen Spawn with Shulkers (1.11+)

summon falling_block ~ ~1 ~ {Block:stone,Time:1,Passengers:[{id:falling_block,Block:redstone_block,Time:1,Passengers:[{id:falling_block,Block:activator_rail,Time:1,Passengers:[{id:commandblock_minecart,Command:gamerule commandBlockOutput false},{id:commandblock_minecart,Command:fill ~2 ~-3 ~-2 ~8 ~-1 ~2 purpur_block 0 hollow},{id:commandblock_minecart,Command:fill ~2 ~-2 ~-2 ~8 ~-2 ~2 stained_glass 2 0 purpur_block},{id:commandblock_minecart,Command:"/tellraw @a [{\"text\":\"Thanks for installing: \",\"color\":\"red\"},{\"text\":\"Endermen Spawn with Shulkers\",\"bold\":\"true\",\"color\":\"light_purple\"},{\"text\":\"\\nCommand by Evtema3, suggestion by /u/massive_potatoes\",\"color\":\"gold\",\"bold\":\"false\",\"italic\":\"true\"}]"},{id:commandblock_minecart,Command:/scoreboard objectives add counter dummy},{id:commandblock_minecart,Command:"/summon armor_stand ~ ~ ~ {CustomName:\"counter\",Invisible:1b,Marker:1b}"},{id:commandblock_minecart,Command:setblock ~1 ~-3 ~ wall_sign 4 0 {Text1:"{\\\"text\\\":\\\"\\\"}",Text2:"{\\\"text\\\":\\\"Command by\\\",\\\"color\\\":\\\"dark_red\\\"}",Text3:"{\\\"text\\\":\\\"Evtema3\\\",\\\"color\\\":\\\"red\\\",\\\"bold\\\":true}",Text4:"{\\\"text\\\":\\\"\\\"}"}},{id:commandblock_minecart,Command:setblock ~1 ~-2 ~ wall_sign 4 0 {Text1:"{\\\"text\\\":\\\"\\\",\\\"clickEvent\\\":{\\\"action\\\":\\\"run_command\\\",\\\"value\\\":\\\"/kill @e[name=counter,type=armor_stand]\\\"}}",Text2:"{\\\"text\\\":\\\"Destroy\\\",\\\"color\\\":\\\"blue\\\",\\\"clickEvent\\\":{\\\"action\\\":\\\"run_command\\\",\\\"value\\\":\\\"/tellraw @a [{\\\\\\\"text\\\\\\\":\\\\\\\"You have successfully removed this module.\\\\\\\",\\\\\\\"color\\\\\\\":\\\\\\\"red\\\\\\\",\\\\\\\"italic\\\\\\\":\\\\\\\"true\\\\\\\"}]\\\"},\\\"bold\\\":true}",Text3:"{\\\"text\\\":\\\"Machine\\\",\\\"color\\\":\\\"blue\\\",\\\"bold\\\":true}",Text4:"{\\\"text\\\":\\\"\\\",\\\"clickEvent\\\":{\\\"action\\\":\\\"run_command\\\",\\\"value\\\":\\\"fill ~ ~-1 ~-2 ~7 ~1 ~2 air\\\"}}"}},{id:commandblock_minecart,Command:setblock ~1 ~-1 ~ wall_sign 4 0 {Text1:"{\\\"text\\\":\\\"\\\"}",Text2:"{\\\"text\\\":\\\"Endermen Spawn\\\",\\\"color\\\":\\\"dark_purple\\\"}",Text3:"{\\\"text\\\":\\\"with Shulkers\\\",\\\"color\\\":\\\"dark_purple\\\"}",Text4:"{\\\"text\\\":\\\"\\\"}"}},{id:commandblock_minecart,Command:fill ~3 ~-2 ~-1 ~7 ~-2 ~1 chain_command_block 5},{id:commandblock_minecart,Command:setblock ~7 ~-2 ~1 chain_command_block 1},{id:commandblock_minecart,Command:setblock ~3 ~-2 ~ chain_command_block 3},{id:commandblock_minecart,Command:fill ~7 ~-2 ~ ~4 ~-2 ~ chain_command_block 4},{id:commandblock_minecart,Command:setblock ~7 ~-2 ~-1 chain_command_block 3},{id:commandblock_minecart,Command:setblock ~6 ~-2 ~-1 repeating_command_block 5},{id:commandblock_minecart,Command:setblock ~3 ~-2 ~-1 repeating_command_block 5},{id:commandblock_minecart,Command:blockdata ~7 ~-2 ~1 {auto:1,Command:/scoreboard players tag @e[type=enderman] remove placeShulker}},{id:commandblock_minecart,Command:blockdata ~6 ~-2 ~1 {auto:1,Command:/entitydata @e[type=enderman,tag=placeShulker] {carried:air}}},{id:commandblock_minecart,Command:blockdata ~5 ~-2 ~1 {auto:1,Command:/scoreboard players tag @e[type=enderman,tag=placeShulker] remove holdShulker}},{id:commandblock_minecart,Command:blockdata ~4 ~-2 ~1 {auto:1,Command:/execute @e[type=enderman,tag=placeShulker] ~ ~ ~ summon shulker ~ ~ ~ {Color:10b}}},{id:commandblock_minecart,Command:blockdata ~3 ~-2 ~1 {auto:1,Command:/execute @e[type=armor_stand,name=counter,score_counter_min=33,score_counter=33] ~ ~ ~ scoreboard players tag @r[type=enderman,tag=aggro] add placeShulker}},{id:commandblock_minecart,Command:blockdata ~3 ~-2 ~ {auto:1,Command:/scoreboard players tag @e[type=enderman,tag=holdShulker] add aggro {Attributes:[{Modifiers:[]}]}}},{id:commandblock_minecart,Command:blockdata ~4 ~-2 ~ {auto:1,Command:/scoreboard players tag @e[type=enderman] remove aggro}},{id:commandblock_minecart,Command:blockdata ~5 ~-2 ~ {auto:1,Command:/entitydata @e[tag=holdShulker,type=enderman] {carried:purple_shulker_box}}},{id:commandblock_minecart,Command:blockdata ~6 ~-2 ~ {auto:1,Command:/scoreboard players tag @e[type=enderman,tag=spawned] remove enderman}},{id:commandblock_minecart,Command:blockdata ~7 ~-2 ~ {auto:1,Command:/execute @e[type=armor_stand,name=counter,score_counter_min=99,score_counter=99] ~ ~ ~ scoreboard players tag @r[type=enderman,tag=enderman,c=1] add holdShulker}},{id:commandblock_minecart,Command:blockdata ~7 ~-2 ~-1 {auto:1,Command:/scoreboard players tag @e[type=enderman,tag=enderman] add spawned}},{id:commandblock_minecart,Command:blockdata ~6 ~-2 ~-1 {auto:1,Command:/scoreboard players tag @e[type=enderman,tag=!spawned] add enderman}},{id:commandblock_minecart,Command:blockdata ~5 ~-2 ~-1 {auto:1,Command:/scoreboard players add @e[type=armor_stand,name=counter] counter 0}},{id:commandblock_minecart,Command:blockdata ~4 ~-2 ~-1 {auto:1,Command:/scoreboard players set @e[type=armor_stand,name=counter,score_counter_min=100] counter 0}},{id:commandblock_minecart,Command:blockdata ~3 ~-2 ~-1 {auto:1,Command:/scoreboard players add @e[type=armor_stand,name=counter,score_counter=99] counter 1}},{id:commandblock_minecart,Command:setblock ~ ~ ~1 command_block 0 0 {Command:fill ~ ~-3 ~-1 ~ ~ ~ air}},{id:commandblock_minecart,Command:setblock ~ ~-1 ~1 redstone_block},{id:commandblock_minecart,Command:kill @e[type=commandblock_minecart,r=1]}]}]}]}