Follow the steps in this link to score your kid's bird. I did have a little chuckle when I read the bird had a LIVE weight of 20.5#. There should be no need to do anything special, as the beard and spurs shouldn't shrink. The one thing you may want to look at right away is to make sure the scale used to weigh the bird meets the contest rules if there are any specifying it has to be on a scale that is marked legal for trade. Is there anything that states that and/or if you had to have it weighed on that type of scale and the weight certified by someone other than yourself? Given the weight and measurements, if you did them correctly, the bird scores 71.5 and that's a really great score!
http://www.nwtf.org/hunt/records/score