Hey so I only just realized something *off* about Kingdom

Okay, so in the original Beast Wars, the current Gen Transformers are scaled to be tiny compared to the older generation of Transformers. E.g, Primal being about the size of Prime's head, and so on.

In Kingdom, they are all roughly the same size, and they seem to scale with the vegetation around them, while the majority of the Maximals and Preds seem to scale off each other correctly

Therefore, at a rough guess, the Autobots and Decepticons are probably around 6ft tall or so, less in Vehicle mode.

So in conclusion, Megatron turns into a 'Tank' that probably comes up to your waist.