Well, you could do corrected frame fronts, frame crossmembers, front axles, rears - camelback and air ride, steering boxes, brake drums and cylinders, radiators, air cleaners - really lots of stuff. You might want to check my thread here: http://cs.finescale.com/fsm/modeling_subjects/f/4/t/127400.aspx
Good luck and have a nice day
Paweł