What parts are soley on the rally? Of course the front bumper is different, but what not so obvious parts does it not share with the p4de or sl4sh? Different motor mount? Battery trey? Wheel base is only .05" off, so bodies designed for slash (like proline) could be used right? Reciever box looks different. Rear end like p4de. Seems like the top rear body mount, front bumper assembly and chassis are the only differences.