A landship is a ship/boat who can drive on land. This one lives in South-East Asia in the Java Sea and in Jawa itself which holds Homo Erectuses and many creatures from the Devonian through Triassic.
The person also has a 360 degrees turret with an early autocannon which is 20mm, most of their body is dedicated to making ammo for the gun which fires 60 rounds per minute. The reason most of their body is dedicated for this is because matter makers were pretty primitive at the time.