I'm also using MoI3d to model environmental props (walls, structures, etc). So the scale is sometimes much bigger than that. I've been eye balling things for a while, but recently, precision had become an issue when dealing with the grid settings and exporting models to other 3d packages. This is why I am curious about all this and want to find a way to reliably match the grid and scale setting from MoI3d and other packages.