Buffet - Quantity Planning

I'm preparing a dinner buffet and am curious how much of each dish I should prepare. Everything online talks about cups/oz per person but that doesn't help me imagine it in my head when I read recipes with different serving yields.

The guest list is about 50 adults but RSVPs have not come in yet. I'm planning a Mardi Gras theme party because the ingredients are pretty economical and filling. I might add a green salad of sorts or some chips or cheese at the beginning, but I've chosen these main dishes:

- Muffuletta sandwiches
- Red Beans & Rice
- Cajun shrimp casserole
- Chicken & Sausage Gumbo with rice
- Cajun Corn Maque Choux (salad)

Each recipe was originally made for 6-8 servings. If I prep enough of each (except for the Muffulettas which I am making out of long ~1lb loaves) to fill an average disposable 11x15" aluminum pan that you can get at a grocery store, how many pans should I make and how many loaves of sandwiches? Or if it's easier - how many servings of each dish should I make? Is this a good enough variety of food? Dessert will be a birthday cake. Thanks for the help!