Hull was all riveted.
On each side was an oval pistol port.
Superstructure / Hull
At the rear of the hull was 2 circular ports, and on each side of the hull was a single circular port. The right side had an access door for the crew. Later models had a smoke candle rack installed on the rear hull.
The driver of the M15/42 was at the front and to the left in the hull. The machine gunner/radio operator was on the right in the front.
The engine was changed to a gasoline model as diesel stocks were dwindling.
There were four sets of two wheel that were mounted to assemblies that had semi-elliptical springs. The drive sprocket was located at the front of the M15/42 and the idler at the rear. There were also three return rollers.
Late models had a new drive sprocket with four large guide teeth.