Do please look through the festive family brunch.
www.ellenskitchen.com/bigpots/plan/brunch100.html

Please consider skipping the pork sandwiches, messy and not needed with this menu. If you want another meat, ham or sausage would be a better choice.

1 large biscuit per person, 1/3 the recipe for 200 of the sausage gravy.
www.ellenskitchen.com/bigpots/sausage.html

2 mini muffins per person- large ones not the best choice for this event.

The breakfast casserole is what? With or without meat, potatoes, cheese, eggs? Quiche type?

Veggies mostly don't get eaten, unless it is something like a spinach or broccoli souffle or green bean casserole.

Meatballs 10 pounds, 3 quarts sauce.

How about a hot fruit compote as the fruit?

Instead of cheese and crackers what about cheese grits or grits and grillades?

For the beverages, the beverage planning page will do, unless your group is different than most. Usual also to have juice as well, 1 quart per 5.
www.ellenskitchen.com/bigpots/plan/bevmisc100.html