Cocos2d 2.0 game like Sheep Cannon

Universal iOS game similar to Sheep Cannon Simple graphic sprites OK. Clean commented code required. Use Cocos2d 2.0 Box2d/Chipmunk for launching the object from the cannon. mechanics to detect object collisions. Have you done this before? If so this should be very easy. Please provide reference to what you have done before. Must supply project that can build and run in XCode 4.0 and run in simulator.