A video about this command can be found here :
https://youtu.be/4ukS3m92P6o
1.11 updated version : https://minecraftcommand.science/commands/45709
Fight Santa! Get gifts! Instant build ice turrets and ice castles! Turn the nether into overworld!
You will need my "custom crafters" command block contraption too : https://minecraftcommand.science/commands/45582