Much to the chagrin of a previous Concours winner, his entry at the next Nats with a different airplane received a mediocre appearance points score. When sitting on the floor, it was an outstanding model, potentially a 20 point winner. HORRORS! The appearance judges turned the model over, as they did with all of the models there, which he did not expect. The judges discovered the bottom was not executed to the same level of detail as the top surfaces and was not even polished/rubbed out as had been the top.
(I am intimately familiar with what the two appearance judges saw that year.)
Keith