It's handy to have a scale for this recipe, to weigh the dry pasta and cheese. I've added alternate measurements where I could. Use a really great cheddar for this, as well as whole milk, if you can. It will make all the difference in the finished dish. I like to use two cheddars, a really great, aged one for most of it and then another one, a bit milder but still sharp, for a bit of depth of flavour. Experiment and find your favourite combinations.
Be sure to read the "Cook's Notes" in the original post, for more tips, options, substitutions and variations for this recipe!