The defining fact about the Italian B.M.T. is that it is not a recipe but a stack of standardized counts, assembled the same way down a glass line in front of the person ordering it. Genoa salami, pepperoni, and Black Forest ham are portioned to fixed slice counts and fanned across a split soft roll so the cured meat runs the full length of the bread rather than bunching at the center. Nothing about the build is improvised. The sandwich is engineered so that an untrained hand can produce the identical thing from a script, and that repeatability, not any single ingredient, is what the format is actually selling.
The craft is in the layering order, because the line build has to stay structurally sound while the customer adds an unpredictable load on top. The three meats go down first as the flavor and protein base, shingled so each bite gets all three rather than a stripe of one. Cheese goes on the meat; the chosen vegetables, lettuce, tomato, onion, pepper, olive, go above that as the cold wet layer; the oil, vinegar, and dried oregano finish on top so the seasoning runs down through the stack instead of soaking the crumb from below. The roll is soft and yielding by design, sized to the meat count so the bread-to-filling ratio holds whether the sandwich is built lean or piled, and the order of assembly is the only thing keeping a wet, customer-dictated filling from collapsing the bread before it is wrapped.
The variations are a matter of which line script is run rather than a different sandwich. Toasting the assembled roll briefly firms the crumb and slackens the cheese, which changes the texture without changing the build. Swapping the bread, doubling the meat count, dropping the cheese, or finishing with a different sauce are all standardized deviations from the same fixed sequence rather than new sandwiches. The cold cut combo and the spicy Italian run the identical architecture with a different meat list and deserve their own articles rather than being crowded in here.