Summon Beacon Tower

/summon MinecartCommandBlock ~ ~1 ~ {Command:/summon WitherSkull ~7 ~-1 ~ {CustomName:"Beacon",direction:[]},Riding:{id:FallingSand,Riding:{id:MinecartCommandBlock,Command:/execute @e[type=WitherSkull,name=Beacon] ~ ~ ~ /fill ~4 ~ ~4 ~-4 ~ ~-4 minecraft:iron_block 0 replace air,Riding:{id:FallingSand,Riding:{id:MinecartCommandBlock,Command:/execute @e[type=WitherSkull,name=Beacon] ~ ~ ~ /fill ~3 ~1 ~3 ~-3 ~1 ~-3 minecraft:iron_block 0 replace air,Riding:{id:FallingSand,Riding:{id:MinecartCommandBlock,Command:/execute @e[type=WitherSkull,name=Beacon] ~ ~ ~ /fill ~2 ~2 ~2 ~-2 ~2 ~-2 minecraft:iron_block 0 replace air,Riding:{id:FallingSand,Riding:{id:MinecartCommandBlock,Command:/execute @e[type=WitherSkull,name=Beacon] ~ ~ ~ /fill ~1 ~3 ~1 ~-1 ~3 ~-1 minecraft:iron_block 0 replace air,Riding:{id:FallingSand,Riding:{id:MinecartCommandBlock,Command:/execute @e[type=WitherSkull,name=Beacon] ~ ~ ~ /setblock ~ ~4 ~ minecraft:beacon,Riding:{id:FallingSand,Riding:{id:MinecartCommandBlock,Command:/kill @e[type=WitherSkull,name=Beacon],Riding:{id:FallingSand,Riding:{id:MinecartCommandBlock,Command:/setblock ~ ~ ~ lava 6,Riding:{id:FallingSand,Block:minecraft:activator_rail,Time:1,DropItem:0}}}}}}}}}}}}}}}}