The variants have different minimum base thickness.
The example variants:
I've provided 3mfs to make it easier for you to use these as a starting point for further customization. The GCODE has verbosity enabled for use with Octolapse.
I made this remix to have the base be configurable, and to avoid the first layer of the base (apart from the walls) being a bridge across the entire width. I've scaled it to 80% of the original so it fit on my print bed.
The author remixed this model.