Do the generic scales of objects influence the grid snapping at all, meaning does every object need to be 512/512/512 for example or can it be some totally random scale? The box example worked by the way.
Can be any size you want but if you want it to snap to each other easily it needs to be 32 64 128 256 512 etc yes, or any combination such as 192. For non modular it obviously doesn't matter, like a tree.