There's now a Zoids Size Comparison Tool linked from the Zoids Index! There's a ton of disclaimers that go along with this (listed at the bottom of the page for it), but basically, this is just a fun tool to get a rough idea of how different Zoids might size up against each other. This is provided purely for the sake of amusement, and for a variety of reasons, some measurements or sizes will be imperfect, or just look off. There's still a lot of Zoids to add to this over time, but for now it includes a bunch of the basics.