Italy help at any time

We are looking at taking an 18t box to Italy in a couple of weeks time, and I have not priced for Italy before. I have added all the usual costs, with diesel at an average rate, added nights out, ferries, Eurovignette for Belgium and Luxembourg, German Maut, Austrian go box and tolls, Italian tolls, CMR insurance. Have I got everything? I don’t think the route includes any bridge or tunnel tolls as far as I am aware? (Calais, Brugge, Brussels, Namur, Luxembourg, Merzig, Mannheim, Karlsruhe, Munich, Keifersfelden, Innsbruck, Bolzano, Verona, Venice). Any help / thoughts very welcome. (I am snowed under with paperwork so may be slow to answer any questions, but will check back later). Many thanks in advance.