UE4 Projection mapping physical model scale?

Hi All
I downloaded Lightact as trial version, and really its amazing software, and going to place order very soon
my intention to use it with UE4 for interactive projection mapping for real estate marketing
I have a technical question about the virtual model scale vs physical model scale,
to describe what i’m going to do :
I have an UE4 model that is extend on 500 meter by 500 meter which match the real location of the buildings, My 3d printed scale model is on 1 meter by 1 meter,
looking at the nDisplay config file generated from Lightact it defines the position and rotation of the calibrated projectors.
Does that mean my model inside UE4 should be 1 meter by meter 1?