Hey Firebrand-
Using a box created in 3DS Max at a grid spacing of 10cm and then importing it into the engine set to a grid spacing of 10 showed that it followed the grid properly. Here is a link to a dropbox with the FBX file of the box if you’d like to test it as well however from our tests the measurements are working as expected.
Here are a couple of images from 3DS Max and the engine showing the box and grid settings:
