Build order:

14 Depot
15 Gas
16 First Barracks
16 Second Barracks
18 Orbital
18 Depot
21 Depot

Explanation

Send the first SCV you make straight to the opponents third, then send the SCV making the first Depot to the same place after the Depot is finished.
The first depot will be about 75% done when you take the gas.
At about 50 game seconds you can start your first proxy Barracks and your second SCV should be arriving to the proxy location.
When the refinery finishes only put 1 extra SCV (2 total).
Second proxy Barracks can be built at around 1:05 game time.
Keep building SCV's until the first Barracks finishes then start a tech lab and an Orbital right away.
Start Concussive Shells when the tech lab on the first Barracks completes.
The second Barracks will now almost be done, start a tech lab right away.
Start producing Marauders as soon as each tech lab finishes.
When the Orbital finishes, drop a mule and put a third SCV into the refinery.

Now both Tech Labs should be finished. Keep making Marauders constantly.
You start the attack when you have 3 marauder (and the 2 scvs)
Protect the SCV's as they build bunkers. Marauders have strong range and with Concussive Shells you shouldn't have any problems kiting. They are also strong at busting bunkers.

Counters to this build includes counter attacks, fast banshees.

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