1: I said that it would stop ANY shots. IE, if it doesn't penetrate in real life, it won't penetrate ingame, that's how the game is made. If anything, it'll cause the slightest bit of damage. The 60mm, while technically penetrable, was heavily slopped, making it more like 90 or 100mm of armour.
Also, the 57mm and the 6lber are the exact same gun. Its just that the Brits also got a few APDS shells, meaning they could penetrate much more armour.
2: Jagdpanther= great tank, but just not important enough for Normandy. Personally, I'd rather see the Jagdpanzer, as that was at least common.
3: ZB-26 was mostly in 2nd line and reserve units by 1944. Therefore, the 21st Panzer Division would def have a bunch for Liebsey, and it would be a great weapon for Juno or the British beaches. Omaha, eh, I'm not so sure, as the 352 was actually rather well equipped.