After three iterations, the robot is finally done. I was able to make the sound chip work initially, but when I soldered it, something went wrong and it stopped working. I rectified this by using an iPod shuffle, and the same speaker I had hooked up to the sound chip. It functioned exactly the same, so crisis avoided.
I have constructed my car base form. I have purchased the sound and motor shields and sensors. I was able to wire my distance sensor and have it operational. I am having difficulty stacking my motor shield and having my sensor operate at the same time. It is my main setback at the moment. Also I melted my battery pack accidentally, but I replaced it, so its fine.