How it should be:
Specifically, "y" should be passable but currently isn't, and, when YARD_OPEN is set to 1, then "c" should be passable but currently isn't.FBI File Content Description
YardMap
Defines in more detail the "footprint" of a construction yard (or any stationary building). As an example, the ARM Adv. Air Plant data at the right has 6 groups of 7 values defining an X-Z coordinate "footprint" for the construction yard. The following values are available:
"f" indicates the space is occupied by a feature (e.g. Dragons teeth)
"o" indicates occupied points on ground where a unit may not pass. By default, all values are "o".
"O" - Occupied when building is open - never used.
"c" defines the "hole" (typically in construction plant units) where the units are built and where they enter or exit. closed yard - "Openyard/Closeyard" on land.
"C" - closed yard - "Openyard/Closeyard" on water.
"w" seems to indicate those parts of a ship yard that are above water
"g" (or "G") indicates that the space can operate over a geothermal vent. Otherwise, operates just like an "O". Created specifically for the geothermal plant.
"y" - standard yard - no footprint on land
"Y" - standard water yard - no footprint on water. "Y" is simply a location that will never have a footprint, no matter what.
As you know, footprints are square, but your units aren't always. This allows you to shape the footprint a little. (i.e. ARMLAB, the corners are always "footprintless")
It's very annoying not to be able to have buildings with passable yard.