The motor is for vibration. The kids love it when they feel there hand vibrate.for the battery I bought a clip holder for AA battery's from radio shack that makes all 8 equal 12v and it attaches to the 9v end. You can find them anywhere. The speaker idea you do what you think. Just make sure ohms match up. Mine is in butt so no problem for size. The sound is an attention getter, especially at con's when I turn it up. It is a BFG of course.for the light strip I protected that with a clear 3/4" tube down center of barrel.mine came around a Star Wars poster I bought. Double score! You bought a great sound/light kit. Take your time and you'll get it.