>>6464826True. But what I meant by this is that you'll never find complicated shapes like pic related for the turret. Those kind of things were only doable with casting, which was almost unheard of at the time.
hence, flat surfaces and geometric shapes. Sure, there are still outliers (FCM 36 or BT-SV being the most notable exceptions imho), but nothing looks more midwar than a big riveted box.