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Do you have a source for the cardboard ERA plates? I only found the following, but apparently there is supposed to be cardboard in between the layers: https://www.reddit.com/r/TankPorn/comments/t73p1e/what_found...

I don't, but if the link you posted is the truth then I could have been mistaken.

You can clearly see in the pictures though that there are no plates on the outside.