Reply To: 2016 Q3 build challenge – derby cars Home › Forums › MOCs › Build challenges! › 2016 Q3 build challenge – derby cars › Reply To: 2016 Q3 build challenge – derby cars July 24, 2016 at 6:44 pm #17136 JoshKeymaster @lunch36 – you have an opinion? If not, I’d say if it falls off the track with 5 studs wide, your loss. i’d say no “special time accommodations will be made for rebuilding.