I'll give that much for the Elefant. But the others (plus the other two upcoming ... hmmm) I don't know. A Centurion, Churchill or even a Comet could have been a hit. But if you do go with a T54/55 you'll need something to oppose it with in it's time period ... right?
I will have to say, the Maus doesn't fit (like the E-100) but it's so big and bad and all!
And Green Amphibian?

Don't be hatin'! It really didn't come from over there.
(Okay, back to the workbench)
~ Jeff