The Italeri kit is pretty much a copy of the Trumpeter kits, with a few corrections and updates. It isn't worth the money in my opinion. The added resin bits are so-so and not really accurate. The turret pieces are too flat and mount so that the full thickness of the turret armor isn't represented. The engine compartment is bare other than the engine itself. It should have all sorts of things in there, think of your cars engine compartment with hoses, wires, generator, battery, etc.
If you want a good model with an interior, get one of the older Dragon M1A1 or M1A2 kits. They come with a driver's area and the upper turret interior details. It can be the base for a great interior. It represents the thickness of the turret armor too. For an excellent engine, get the CMK engine and compartment set.
I used one of the Dragon interiors as a base for my
OIF 1 USMC M1A1 HC "Angry American"Hope that helps.