Fettucine alfredo for 50

I am looking for a recipe for fettucine alredo for 50 or 100. I guess I am going to cook the dinner for my DD's wedding in April. I will make some the day before and other prep work and a dear friend and hubby will finish it off for me. I am going to serve a breaded chicken breast, fettucine alfredo, green beans, green salad, rolls, and fruit. We will prepare for 150. I feel pretty confident about this except the fettucine recipe for that many would certainly help. I would like to make a white sauce from scratch.