To use, copy and paste this command into a command block, and activate it with with a button/lever!

/summon FallingSand ~2 ~5 ~ {Time:1,Block:redstone_block,Riding:{id:"FallingSand",Time:1,Block:command_block,TileEntityData:{Command:"/fill ~ ~-12 ~-1 ~ ~ ~-1 redstone_block"},Riding:{id:"FallingSand",Time:1,Block:command_block,TileEntityData:{Command:"fill ~ ~2 ~ ~ ~-11 ~-1 air"},Riding:{id:"FallingSand",Time:1,Block:command_block,TileEntityData:{Command:"setblock ~ ~-10 ~2 stone_button 2"},Riding:{id:"FallingSand",Time:1,Block:command_block,TileEntityData:{Command:"setblock ~ ~-8 ~2 wall_sign 4 replace {Text1:Destroy Machine}"},Riding:{id:"FallingSand",Time:1,Block:command_block,TileEntityData:{Command:"setblock ~1 ~-8 ~2 command_block 0 replace {Command:kill @e[type=SnowMan]}"},Riding:{id:"FallingSand",Time:1,Block:command_block,TileEntityData:{Command:"setblock ~2 ~-7 ~2 command_block 0 replace {Command:fill ~-1 ~-1 ~ ~3 ~4 ~-4 air}"},Riding:{id:"FallingSand",Time:1,Block:command_block,TileEntityData:{Command:"summon SnowMan ~3 ~-5.5 ~ {NoAI:1}"},Riding:{id:"FallingSand",Time:1,Block:command_block,TileEntityData:{Command:"setblock ~2 ~-6 ~ redstone_block 0"},Riding:{id:"FallingSand",Time:1,Block:command_block,TileEntityData:{Command:setblock ~2 ~-5 ~-1 command_block 0 replace {Command:setblock ~ ~ ~1 air}},Riding:{id:"FallingSand",Time:1,Block:command_block,TileEntityData:{Command:"setblock ~2 ~-4 ~1 command_block 0 replace {Command:setblock ~ ~ ~-1 redstone_block}"},Riding:{id:"FallingSand",Time:1,Block:command_block,TileEntityData:{Command:"setblock ~3 ~-3 ~ command_block 0 replace {Command:/particle snowshovel ~ ~4 ~ 1 1 1 0 10}"},Riding:{id:"FallingSand",Time:1,Block:command_block,TileEntityData:{Command:"/fill ~4 ~-1 ~-1 ~2 ~-1 ~1 snow"},Riding:{id:"FallingSand",Time:1,Block:command_block,TileEntityData:{Command:fill ~1 ~ ~2 ~5 ~4 ~-2 glass 0 hollow}}}}}}}}}}}}}}}