If you want to make a really interesting model, you could scratchbuild the armour arrays that would become visible if you lifted off the outer shell on the real tank

Here's a cross-section of the turret side armour on the original M1:

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Possibly it's been changed on the M1A2, but going by this photo of a destroyed one of those, it doesn't look much different:

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The stack of three plates with tube-things behind it, that's lying on the engine deck, is probably the turret front armour.