Frickin awesome!
Awesome game, man. Just beat it. Kind of easy after you start finding more people, though, since each person you have with you repairs 5% per person and then once you start finding better guns it becomes rare for a zombie to even get close to it. Really like what you did. Gives you a real feeling of hopelessness until you find the Barrett, and then once you get that you can kill whole rows of zombies with one shot no questions asked unless you have soldiers in the mix. :) I gasped and said "HOLY SHIT!" when I fired that monster the first time.
What I didn't like though was how uncannily similar the machine guns were in overall power. Except for the AK-47, I found that most of the machine guns and assault rifles feel exactly the same, except one has more ammo in its magazine but takes more shots to kill something, one has a larger spread, etc.
Think it needs to be made a bit harder though. Like, make it a little easier to lose people while searching. And make the survivors more useful in combat. They should fire their guns a bit more often. The only survivor I found useful was the one with the hunting rifle because he actually kills with his one shot.