As if you are cooking for your neighbors is good advice. Judges will probably be made up of whatever org is sponsoring the comp. They will only be taking small bites. They might get into your second slice of brisket, won't get into your third. So you always want your best up front.
They will be sticklers on the width of your brisket slice. Too thin or too wide, they won't accept, and you will have to high tail it back to get another slice. Slices have to be whole. Split or tear the top of a slice getting it into your tray, and they won't accept it.
With 50 teams they might make you turn in two chix halves and 9 ribs and 9 slices of brisket as opposed to the usual half chix , 7 ribs and 7 slices of brisket.
Down here, any way, no one even touches the dark meat on the half, so you concentrate on getting the breast right. Take it off when the breast hits 161-165 range.
As for presentation, make it look pretty.Put it in the box in a orderly manner. You can't sauce, but you can glaze. It has to be at least "tacky" or they won't accept it.
20 min windows and turn ins will be an hour apart. If you have over 50 there, they even might go to 1 and a half hr between turn ins. That should be a breeze to someone used to doing KCBS. Hope this helped a little.
Mike