@splicepoint The above models are pretty all replications from screenshots and live streams conducted by the devs. So if you e.g. download the standard worker model, you can simply count the size.
I do not remember that the devs have mentioned that 10x10x10 voxels in QC are equal to 1 voxel in Stonehearth. Can you refer to the stream / comment where you have this information from?
In the last stream it was mentioned that the icon-version of larger items in the game will be sized 10x10x10 voxels, to allow for easier animations. In the past it was shown / mentioned that buildings are up-scaled by 1:10, i.e. 10 voxels of the standard worder will be the size of 1 voxel of a building. But this are the only reference to numbers I have in my mind.
… which doesn’t automatically mean that I am right 
.