The 8 vs 6 is a bit unclear, as we haven't seen any humanoid but pictures of the back hatch of 28mm (FW) and 8mm (new AT) versions, the official sizes ("real" 33m vs big 22 inches vs 5 inches... so 28mm goes to 6.4mm). And maybe it was the reason for the cancelation of a Kickstarter.
[spoiler]
![Image](https://i.4pcdn.org/tg/1533965039301.jpg)
Warlord pose here is pretty straight, 130mm (120mm carapace).
![Image](https://spikeybits.com/wp-content/uploads/2018/05/Screenshot_29.jpg)
Here knights look to be as tall as the base is wide. So ~40mm?[/spoiler]
How tall are those others?