Guided Rocket Launcher in "one" command

/summon FallingSand ~ ~1 ~ {Block:redstone_block,Time:1,Riding:{id:"FallingSand",Block:command_block,TileEntityData:{Command:/fill ~ ~0 ~1 ~ ~-17 ~1 redstone_block},Time:1,Riding:{id:"FallingSand",Block:command_block,TileEntityData:{Command:setblock ~ ~3 ~1 stone},Time:1,Riding:{id:"FallingSand",Block:command_block,TileEntityData:{Command:setblock ~ ~4 ~ command_block 0 replace {Command:fill ~ ~2 ~ ~ ~-21 ~1 air}},Time:1,Riding:{id:"FallingSand",Block:command_block,TileEntityData:{Command:setblock ~3 ~-14 ~-1 command_block 0 replace {Command:scoreboard players add @e[type=Arrow] RocketTag 1 {damage:5.5}}},Time:1,Riding:{id:"FallingSand",Block:command_block,TileEntityData:{Command:setblock ~3 ~-13 ~1 command_block 0 replace {Command:execute @e[type=Arrow,score_RocketTag_min=1,score_RocketTag=1] ~ ~ ~ summon Fireball ~ ~ ~ {ExplosionPower:0,direction:[],CustomName:Rocket}}},Time:1,Riding:{id:"FallingSand",Block:command_block,TileEntityData:{Command:setblock ~4 ~-12 ~-1 command_block 0 replace {Command:scoreboard players add @e[type=Arrow] GuidedRocketTag 1 {damage:6.0}}},Time:1,Riding:{id:"FallingSand",Block:command_block,TileEntityData:{Command:setblock ~4 ~-11 ~1 command_block 0 replace {Command:execute @e[type=Arrow,score_GuidedRocketTag_min=1,score_GuidedRocketTag=1] ~ ~ ~ summon Fireball ~ ~ ~ {ExplosionPower:0,direction:[],CustomName:GuidedRocket}}},Time:1,Riding:{id:"FallingSand",Block:command_block,TileEntityData:{Command:setblock ~5 ~-10 ~-1 command_block 0 replace {Command:scoreboard players add @e[type=Fireball,name=GuidedRocket] RocketTag 1}},Time:1,Riding:{id:"FallingSand",Block:command_block,TileEntityData:{Command:setblock ~5 ~-9 ~1 command_block 0 replace {Command:execute @e[type=Fireball,score_RocketTag_min=2,score_RocketTag=2,name=GuidedRocket] ~ ~ ~ summon Fireball ~ ~ ~ {ExplosionPower:0,direction:[],CustomName:GuidedRocket}}},Time:1,Riding:{id:"FallingSand",Block:command_block,TileEntityData:{Command:setblock ~6 ~-8 ~-1 command_block 0 replace {Command:execute @e[type=Fireball,score_RocketTag_min=4,name=GuidedRocket] ~ ~ ~ kill @e[r=0,type=Fireball,name=GuidedRocket]}},Time:1,Riding:{id:"FallingSand",Block:command_block,TileEntityData:{Command:give @p bow 1 0 {ench:[{id:48s,lvl:7s}],display:{Name:GuidedRocketLauncher}}},Time:1,Riding:{id:"FallingSand",Block:command_block,TileEntityData:{Command:give @p minecraft:bow 1 0 {ench:[{id:48,lvl:6}],display:{Name:RocketLauncher}}},Time:1,Riding:{id:"FallingSand",Block:command_block,TileEntityData:{Command:scoreboard objectives add GuidedRocketTag dummy},Time:1,Riding:{id:"FallingSand",Block:command_block,TileEntityData:{Command:scoreboard objectives add RocketTag dummy},Time:1,Riding:{id:"FallingSand",Block:command_block,TileEntityData:{Command:gamerule commandBlockOutput false},Time:1,Riding:{id:"FallingSand",Block:command_block,TileEntityData:{Command:"fill ~2 ~-2 ~ ~6 ~-2 ~ redstone_block"},Time:1,Riding:{id:"FallingSand",Block:command_block,TileEntityData:{Command:"setblock ~2 ~-1 ~-1 command_block 0 replace {Command:/fill ~ ~ ~1 ~5 ~ ~1 stone 0 replace redstone_block}"},Time:1,Riding:{id:"FallingSand",Block:command_block,TileEntityData:{Command:"setblock ~2 ~ ~1 command_block 0 replace {Command:/fill ~ ~ ~-1 ~5 ~ ~-1 redstone_block 0 replace stone}"},Time:1,Riding:{id:"FallingSand",Block:stone,Time:1}}}}}}}}}}}}}}}}}}}}