Here is a 3DC file set for Blender's metric scale. Should work in other apps as well.  Now this does not mean it is an all inclusive method of creating real world scale but it gives a base to start with. I am now looking at the tools inside 3DC to make it easier to build real world objects.  In other words to see what is possible with 3DC. Edit: Here is an example. One method. Created a simple primitive.  Customized the 3D grid.  One meter main division and 100
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