It has been mentioned before that the dynamite rocket racer electronics work well with a WWS Pro. Do you have to use a mini 7.2 V battery pack and charger or can you use the 4 AAA battery holder that comes with the rocket racer. My concern is the 180 motor that comes with the wws pro. Also, is there room on the chassis for a 4AA battery holder instead. I have a great deal of interest in one of these cars if I can get it running with no additional expense other than the price of the car.