giant ants simply don't fucking work. it's called biomechanics, and it's a subfield of physics.
the most simple way to explain it is this: the reason we cannot build arbitrarily tall buildings is because they would collapse under their own weight. at a certain height, the weight of the overall material overwhelms the ability of the material at the bottom of the building to hold it up. it goes crunch; the building falls down.
so, much as one could not stack more than one or two elephants (precluding a binomial stack of elephants, in which case you could probably get up to four or five layers [however the fuck you managed to get the elephants arranged that way]) without collapse, giant ants are a load of fucking horseshit. calculus has my back, here.