Tried this out the first time, and won very quickly:

8/10 Spawning Pool
Scout to Zerg enemy (be like a quiet spy about it, don't get spotted)
Once SP is finished, make Spine Crawler at the edge of creep
Send troops to defend base and also defend spine crawler (if possible)
Scare them shitless and win (by the 6 minute mark)

If you are interested, here is my replay:

http://www.mediafire.com/?idbw6lus56su6g8