With your latest version, when your inventory is full and you pick up for example the mk2 with factory inside it, the factory disapears. But it tells you your inventory is full.
Expected behaivor: The factory building should be laying on the ground.
Double check that it didn't appear on the ground to the upper left of the upper-left corner of where the factory had been placed. I've seen it appear there; it doesn't appear in the center of the placement.