sc2 firebats are basically bigger tf2 pyros sc1 firebats are squishy there might be some inconsistencies because of how low quality the reference is, such as the head. it definitely doesn't look like that in sc2.
how does a normal human fit in something like this??? how does one have shoulders this wide? how does one even carry those massive fire hand thingies, let alone TWO? I actually had to shrink those arms down they aren't to full scale