some guy tried this build against me on metalopolis close positions with air gap in between
http://www.youtube.com/watch?v=g8DdQjeBbnU
fortunately i hero scanned his main right as he sent out all of his scvs, and got 2 bunkers down in time.
his composition: 14 marines, 11 scvs
my composition: 4 marines, 1 maraud, 19 scvs, 2 bunkers
he suicided everything and i held