Be aware that resizing for HO or 1:160 N scale will make the width of the integrated rails not to scale, nothing will be able to roll on it without customization.
You can now find a bit more description in the attached pdf
The author remixed this model.
This is a "remix" of my own work, prepared as plates for Bambu printer (could work for others, i really don't know), the buildings have been pre-assembled and you got the right number of parts ready to go, no faffing about.