Huge minis have a 3-square diameter base.Gargantuan minis would have a 4-square diameter base.
Colossal minis would have a 6-square diameter base.
Luke's snowspeeder could be considered size Huge.
Luke's snowspeeder was wholly crushed by a single foot of the AT-AT.
Therefore, a single foot of the AT-AT should be at least 2-square diameter.
Conclusion, an AT-AT would be Colossal, and would in fact be a bit undersized. I think it would require a 9-square base, personally.
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