Prep the prosciutto, salami, and fontina first as they're easiest to cut cleanly while cold, but are tastiest after coming to room temperature (as they will do while you prep the other ingredients). 2 large heads of coarsely chopped endive can be subbed for the escarole (as I did here). I couldn't track down cotto salami, so subbed
Fra'mani's salame rosa, a similar style of salami (both are uncured and cooked). The deli counter at my Whole Foods sells it by the pound.