To create sufficient room with the ZT 3 the hull was raised somewhat; the roof plates on the sides and front sloped towards the apex of the vehicle where a cast rotatable cupola provided the commander some height to observe his surroundings, in what was otherwise a very low and sleek construction. The gun was placed to the right of the driver with to its left a co-axial 7.5 mm machine-gun. There was an ammunition stock of eighty shells and 1200 bullets. As the position of the normal air intake was now occupied by the gun, a large roof ventilation grille was present above the third crew member, the gunner/loader. The fighting compartment was very cramped. No radio was present.