Recipe: 12-cheese Macaroni and Cheese

A twitter conversation last night led to some interest in macaroni and cheese recipes, and I wanted to share mine. The cheeses listed include the brand. I do shop at Costco, so finding certain things may be hard if you don't shop there. The Kerrygold Irish butter I get from Fresh & Easy, which I believe is only on the West Coast of the US. Items marked off with an asterisk are optional.

Also: I eyeball everything and never measure, so I'm guesstimating all of the measurements I've included.

( To the recipe! )