I'm building the kit myself, and I noticed an error. Part D2, the mantlet, is supposed to have one hole to the right of the barrel, but it is done with two. These holes are for the gunner's sight. Early models used a binocular sight, with two holes, later models used a simpler monocular sight with one hole. The instructions tell us to open the hole on the right if we are building the tank from Italy, but it's already open. If you aren't
building the Italian front tank, fill the hole on the right and replace the zimmerit pattern.
Hope I helped, and I hope this was coherent!