Looking at it I think the pasta might be off in 2 ways:
First, 4 oz pasta per person seems a bit light, more like 6oz?
If so that would yield 2 servings per your "batch" not 3, or maybe more like 2.5.
Second, that should yield about 2 1/2 cups of sauce, which might service more thatn 12 oz.
To be safe, figuring say 3 servings per pound of pasta, that's what 33 pounds of pasta.
Best to make final adjustments during prep before serving.
First, 4 oz pasta per person seems a bit light, more like 6oz?
If so that would yield 2 servings per your "batch" not 3, or maybe more like 2.5.
Second, that should yield about 2 1/2 cups of sauce, which might service more thatn 12 oz.
To be safe, figuring say 3 servings per pound of pasta, that's what 33 pounds of pasta.
Best to make final adjustments during prep before serving.