While most imperial worlds in the grim future have defenses made to stop tides of unending monsters, the far reached exploratory worlds are not so fortunate. Freshly occupied or terraformed planets recieve little in defenses and the FK-13 Rockrete defense platforms fall within the most common and affordable of these defenses.
These three walls are just half of the defenses I am currently making. Upcoming will be the left and right gates, attachable motor platform, and a few basic walkways.
The dimensions at the largest are 120mmx105mmx55mm
-Update: The corner wall in the photo has been changed so that its 'struts' only reach out as far as the other struts and one side holds the Aquila eagle on it.