Multiplayer Backpacks in one command

/summon MinecartCommandBlock ~ ~1 ~ {Command:kill @e[type=MinecartCommandBlock,r=1],Riding:{id:MinecartCommandBlock,Command:setblock ~ ~-1 ~1 redstone_block,Riding:{id:MinecartCommandBlock,Command:setblock ~ ~ ~1 command_block 0 replace {Command:fill ~ ~-3 ~-1 ~ ~ ~ air},Riding:{id:MinecartCommandBlock,Command:scoreboard objectives add 6UWkL_I dummy,Riding:{id:MinecartCommandBlock,Command:/tellraw @a ["",{"text":"Please Don't claim my work as your own, that isn't the right thing to do.","color":"gold","bold":"true"}],Riding:{id:MinecartCommandBlock,Command:/tellraw @a ["",{"text":"Multiplayer BackPacks By Loozers_Beware has been Successfully Installed","color":"green","bold":"true"}],Riding:{id:MinecartCommandBlock,Command:/scoreboard objectives add CH dummy,Riding:{id:MinecartCommandBlock,Command:blockdata ~3 ~-1 ~-1 {Command:fill ~ ~ ~1 ~5 ~1 ~1 stone},Riding:{id:MinecartCommandBlock,Command:blockdata ~3 ~-1 ~1 {Command:fill ~ ~ ~-1 ~5 ~1 ~-1 redstone_block},Riding:{id:MinecartCommandBlock,Command:blockdata ~4 ~-1 ~-1 {Command:scoreboard players set @e[type=Item] 6UWkL_I 1 {Item:{id:"minecraft:leather"},OnGround:1b}},Riding:{id:MinecartCommandBlock,Command:blockdata ~4 ~-1 ~1 {Command:scoreboard players set @e[type=Item] 6UWkL_I 2 {Item:{id:"minecraft:chest"},OnGround:1b}},Riding:{id:MinecartCommandBlock,Command:blockdata ~5 ~-1 ~-1 {Command:execute @e[score_6UWkL_I_min=1,score_6UWkL_I=1] ~ ~ ~ execute @e[r=0,score_6UWkL_I_min=2,score_6UWkL_I=2] ~ ~ ~ summon Item ~ ~ ~ {Item:{id:"minecraft:leather",Count:1,tag:{display:{Name:"BackPack"}}}}},Riding:{id:MinecartCommandBlock,Command:blockdata ~5 ~-1 ~1 {Command:execute @e[score_6UWkL_I_min=1,score_6UWkL_I=1] ~ ~ ~ execute @e[r=0,score_6UWkL_I_min=2,score_6UWkL_I=2] ~ ~ ~ kill @e[type=Item,score_6UWkL_I_min=1,score_6UWkL_I=2,r=3]},Riding:{id:MinecartCommandBlock,Command:blockdata ~6 ~-1 ~-1 {Command:/effect @a[score_CH_min=2] invisibility 1 1},Riding:{id:MinecartCommandBlock,Command:blockdata ~6 ~-1 ~1 {Command:/scoreboard players set @a CH 3 {SelectedItem:{id:minecraft:leather,tag:{display:{Name:"BackPack"}}}}},Riding:{id:MinecartCommandBlock,Command:blockdata ~7 ~-1 ~-1 {Command:/execute @a[score_CH=0] ~ ~ ~ /fill ~3 ~3 ~3 ~-3 ~-3 ~-3 air 0 replace ender_chest},Riding:{id:MinecartCommandBlock,Command:blockdata ~7 ~-1 ~1 {Command:/effect @a[score_CH_min=2] jump_boost 1 225},Riding:{id:MinecartCommandBlock,Command:blockdata ~8 ~-1 ~-1 {Command:/execute @a[score_CH_min=2] ~ ~ ~ detect ~ ~1 ~ air 0 /setblock ~ ~1 ~ minecraft:ender_chest},Riding:{id:MinecartCommandBlock,Command:blockdata ~8 ~-1 ~1 {Command:/effect @a[score_CH_min=2] slowness 1 225},Riding:{id:MinecartCommandBlock,Command:blockdata ~3 ~ ~-1 {Command:/execute @a[score_CH_min=2] ~ ~ ~ detect ~ ~ ~ air 0 /tp @p[r=1] ~ ~-1 ~},Riding:{id:MinecartCommandBlock,Command:blockdata ~3 ~ ~1 {Command:/scoreboard players remove @a[score_CH_min=1] CH 1},Riding:{id:MinecartCommandBlock,Command:blockdata ~4 ~ ~-1 {Command:/tp @a[score_CH_min=1,score_CH=1] ~ ~1 ~},Riding:{id:MinecartCommandBlock,Command:setblock ~3 ~-1 ~ redstone_block,Riding:{id:MinecartCommandBlock,Command:fill ~3 ~-1 ~-1 ~4 ~ ~-1 command_block,Riding:{id:MinecartCommandBlock,Command:fill ~3 ~-1 ~-1 ~8 ~-1 ~-1 command_block,Riding:{id:MinecartCommandBlock,Command:fill ~3 ~-1 ~1 ~3 ~ ~1 command_block,Riding:{id:MinecartCommandBlock,Command:fill ~3 ~-1 ~1 ~8 ~-1 ~1 command_block,Riding:{id:MinecartCommandBlock,Command:setblock ~1 ~ ~ wall_sign 4 replace {Text1:"{text:\\"To Get A Bag\\",color:green}",Text2:"{text:\\"Drop On Ground\\",color:green}",Text3:"{text:\\"leather + chest\\",color:green}",Text4:"{text:\\"BackPacks\\",color:gold,italic:true,bold:true,underlined:true}"},Riding:{id:MinecartCommandBlock,Command:setblock ~1 ~-1 ~ wall_sign 4 replace {Text1:"{text:\\"------------------------------\\",color:red,bold:true}",Text2:"{text:\\"Right-Click\\",color:red,bold:true,underlined:true}",Text3:"{text:\\"To Destroy\\",color:red,bold:true,underlined:true}",Text4:"{text:\\"------------------------------\\",color:red,clickEvent:{action:\\"run_command\\",value:\\"fill ~ ~-2 ~-2 ~9 ~3 ~2 air\\"},bold:true}"},Riding:{id:MinecartCommandBlock,Command:fill ~2 ~-1 ~-2 ~9 ~ ~2 stained_glass 3 replace stained_hardened_clay 3,Riding:{id:MinecartCommandBlock,Command:fill ~2 ~-2 ~-2 ~9 ~1 ~2 stained_hardened_clay 3 hollow,Riding:{id:MinecartCommandBlock,Command:gamerule commandBlockOutput false,Riding:{id:MinecartCommandBlock,Riding:{id:FallingSand,Block:activator_rail,Time:1,Riding:{id:FallingSand,Block:redstone_block,Time:1,Riding:{id:FallingSand,Block:stone,Time:1}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}