Extra Large Lasagna

I'm pretty sure this isn't the last time I will make lasagna to feed a crowd so I want to jot down my proportions before I forget.   I don't use a recipe-  I just basically try to make it as close to my mom and sister's as I can. This would serve 18-20 people easily.

Meat Sauce:

1 onion
11/2 lbs ground beef
1 1/2 Italian Sausage
2 6 oz cans of tomato paste
1 large (12 oz?) can of tomato sauce
6 lb 6 oz can whole tomatoes (this is a huge Costco sized can)
{plus garlic and lots of seasonings}

Other Ingredients:

2   1 lb boxes of lasagna noodles

2   32 oz containers of ricotta mixed w/ 4 eggs (use a little less of this next time)

5     8 oz balls of fresh mozzerella, sliced

2 cups of parmesan-reggiano cheese, grated