More of a concept. Think of a dark gray or black slab with a motor and usb charged battery. Able to combine multiple batter packs for more power. It’s fairly thin maybe a quarter to half an inch thick. It could be painted other colors to match. The axle length is customizable as needed. The wheels are matching color solid rubber. You can choose diameter and width depending on vehicle. You can add spacers between the vehicle bottom and the motor as needed. The motor and battery is the actual RC car and it attached to the bottom of say the McFarlane Batmobile or the old Star Wars land speeder or even Millennium Falcon and you drive it with the phone app. This could be made in a couple different sizes. Hot Wheels sells hw scale RC cars so already those could be used for a lot. Seems like a less intrusive way of customization for a car with its own value

