The Panzerkampfwagen 35(t) was assembled from a framework of steel "angle iron" beams to which the armour plates were riveted.
A 4 mm (0.16 in) firewall separated the engine compartment from the crew.
It had several mesh-covered openings to allow access to the engine and improve ventilation by drawing air in through the commander's hatch.
This had the advantage of rapidly dispersing gun combustion gases when firing, but several disadvantages.
The constant draft generated by the engine greatly affected the crew during cold weather, the danger of an engine fire reaching the crew compartment was increased and the engine noise and heat increased crew fatigue.

The driver sat on the right side of the tank using a 390 by 90 millimetres (15.4 in × 3.5 in) observation port protected by 50 millimetres (2.0 in) of bulletproof glass and an armoured shutter 28 millimetres (1.1 in) thick.
To his right was a vision slit 120 by 3 millimetres (4.72 in × 0.12 in) with a similar thickness of bulletproof glass.
The Germans replaced the original three colored lights used by the Czechs to communicate with the driver with an intercom system.
The radio operator sat on the left and had his own 150 by 75 millimetres (5.9 in × 3.0 in) observation port with the same protection as the driver's.
His radios were mounted on the left wall of the hull.
The hull machine gun was between the driver and radio operator in a ball mount capable of 30° of traverse, 25° of elevation and depressing up to 10°.
Most of the machine gun's barrel protruded from the mount and was protected by an armoured trough.
The mount had a spotting telescope, but open sights could be used if the plug at the top of the ball mount was removed.
If necessary, the driver could lock the mount into position and fire it himself using a Bowden cable.
The driver's hatch was exposed to direct fire and could be damaged from the front.

The turret ring had a diameter of 1.267 metres (49.9 in).
The turret had a flat face in the center of which was mounted the 3.72 centimetres (1.46 in) main armament.
On the right side was another 7.92 millimetres (0.312 in) machine gun in a ball mount.
The commander had four episcopes in his cupola and a monocular mirror, 1.3 x 30° periscope which he could extend, once he had removed its armoured cover in his hatch, to give vision while "buttoned-up".
As the sole occupant of the turret, the commander was responsible for loading, aiming and firing the main gun and the turret machine gun while simultaneously commanding the tank.
The Germans added an extra crewman on the right side of the turret to load the main gun and to operate the turret machine gun.
Some ammunition had to be removed to accommodate him.

The 8.62-litre (526 cu in) Škoda T-11/0 four-cylinder, water-cooled engine produced 120 horsepower (89 kW) at 1,800 rpm.
Two fuel tanks were fitted, the main tank with a capacity of 124 litres (33 US gal) was on the left side of the engine and the 29 litres (7.7 US gal) auxiliary tank was on the other side.
The engine could run on gasoline, an alcohol-gasoline mixture, and "Dynalkohol" (an alcohol-benzole mixture).
It was mounted in the rear along with the six-speed transmission which drove rear-mounted drive sprockets.
The suspension was derived from the Vickers 6-Ton tank; eight small pairs of road wheels on four bogies per side, each pair of bogies sprung by a single leaf spring, a front idler wheel, and four track return wheels.
An unsprung road wheel was located directly underneath the idler wheel to improve obstacle crossing.
The transmission, brakes and steering were mechanically assisted with compressed air, reducing driver fatigue.
This last feature proved problematic in the extreme conditions of the Eastern Front.

The main armament was a Škoda ÚV vz.
34 (German designation "KwK 34(t)") gun with a pepperpot muzzle brake and a prominent armoured recoil cylinder above the barrel.
Škoda called it the A3.
It fired a .815 kilograms (1.80 lb) armour-piercing shell at 690 metres per second (2,300 ft/s).
It was credited with penetrating a plate inclined at 30° f
The Panzerkampfwagen 35(t) was assembled from a framework of steel "angle iron" beams to which the armour plates were riveted. A 4 mm (0.16 in) firewall separated the engine compartment from the crew. It had several mesh-covered openings to allow access to the engine and improve ventilation by drawing air in through the commander's hatch. This had the advantage of rapidly dispersing gun combustion gases when firing, but several disadvantages. The constant draft generated by the engine greatly affected the crew during cold weather, the danger of an engine fire reaching the crew compartment was increased and the engine noise and heat increased crew fatigue.
The driver sat on the right side of the tank using a 390 by 90 millimetres (15.4 in × 3.5 in) observation port protected by 50 millimetres (2.0 in) of bulletproof glass and an armoured shutter 28 millimetres (1.1 in) thick. To his right was a vision slit 120 by 3 millimetres (4.72 in × 0.12 in) with a similar thickness of bulletproof glass. The Germans replaced the original three colored lights used by the Czechs to communicate with the driver with an intercom system. The radio operator sat on the left and had his own 150 by 75 millimetres (5.9 in × 3.0 in) observation port with the same protection as the driver's. His radios were mounted on the left wall of the hull. The hull machine gun was between the driver and radio operator in a ball mount capable of 30° of traverse, 25° of elevation and depressing up to 10°. Most of the machine gun's barrel protruded from the mount and was protected by an armoured trough. The mount had a spotting telescope, but open sights could be used if the plug at the top of the ball mount was removed. If necessary, the driver could lock the mount into position and fire it himself using a Bowden cable. The driver's hatch was exposed to direct fire and could be damaged from the front.
The turret ring had a diameter of 1.267 metres (49.9 in). The turret had a flat face in the center of which was mounted the 3.72 centimetres (1.46 in) main armament. On the right side was another 7.92 millimetres (0.312 in) machine gun in a ball mount. The commander had four episcopes in his cupola and a monocular mirror, 1.3 x 30° periscope which he could extend, once he had removed its armoured cover in his hatch, to give vision while "buttoned-up". As the sole occupant of the turret, the commander was responsible for loading, aiming and firing the main gun and the turret machine gun while simultaneously commanding the tank. The Germans added an extra crewman on the right side of the turret to load the main gun and to operate the turret machine gun. Some ammunition had to be removed to accommodate him.
The 8.62-litre (526 cu in) Škoda T-11/0 four-cylinder, water-cooled engine produced 120 horsepower (89 kW) at 1,800 rpm. Two fuel tanks were fitted, the main tank with a capacity of 124 litres (33 US gal) was on the left side of the engine and the 29 litres (7.7 US gal) auxiliary tank was on the other side. The engine could run on gasoline, an alcohol-gasoline mixture, and "Dynalkohol" (an alcohol-benzole mixture). It was mounted in the rear along with the six-speed transmission which drove rear-mounted drive sprockets. The suspension was derived from the Vickers 6-Ton tank; eight small pairs of road wheels on four bogies per side, each pair of bogies sprung by a single leaf spring, a front idler wheel, and four track return wheels. An unsprung road wheel was located directly underneath the idler wheel to improve obstacle crossing. The transmission, brakes and steering were mechanically assisted with compressed air, reducing driver fatigue. This last feature proved problematic in the extreme conditions of the Eastern Front.
The main armament was a Škoda ÚV vz. 34 (German designation "KwK 34(t)") gun with a pepperpot muzzle brake and a prominent armoured recoil cylinder above the barrel. Škoda called it the A3. It fired a .815 kilograms (1.80 lb) armour-piercing shell at 690 metres per second (2,300 ft/s). It was credited with penetrating a plate inclined at 30° f
Panzer 35(t)