BIG TIME GRATZ to your son on his Eagle. To many now days frown on the Scouts and that it stands for. I consider it a great organization and great character/skills developer for sons becoming men. HUGE KUDOS!
No expert here; just did a 75 (66 showed up) person feed for my church for a mix of Adults and teenage men/boys. We smoked 14lbs of Pork and 16lbs of brisket and had 45 brauts. I say that was barely enough as we served Buffet style. Teenagers kills food - FAST!
Lessons learned - dish them up and don't do buffet style; and definitely more meat.