Very interesting blog, called The Court Artist. I went back and found he had a sketch of the McDonald oral arguments. The guy holding his arm up to his chin in the gallery looks like it could be NRA General Counsel, and the blonde woman next to him would match his wife. Alan Gura is pretty recognizable up at the podium, but the likeness in this picture makes him look older than he looks in real life.
UPDATE: I’m told it couldn’t be them, based on the seating arrangements at the time. It’s still a nice drawing though.