|Corridor and corner intersection boards with marines|
|Barracks board - note the beds and lockers marked out|
When the boards are joined together the raised sections will act as the 'air ducts'. Movement along these sections will be reduced for Humans and Predators but not for Aliens.
|Garage board with APC and marine|
Some rooms are going to be large open spaces which will allow for ranged weapons to be more effective. Here the marine APC can be driven through providing fire support.