The infantry tank hull was made of rolled armor steel plates. The plates were equally thick and provided ballistic protection. The hull of the tank is of riveted construction, made of armored plates assembled on a frame.

How to Get Infantry Tank Hull
Four-Cylinder + Leaf Spring

Infantry Tank Hull Doodle Tanks Combo
+Leaf Spring = Christie
+Leaf Spring = Morozov
+Tools = Rolled
+MS-1 Turret = MS-1