The first thing the player will want to do on this mission is build a Vehicle Factory.  All structures in the game are built by Hovertrucks.  One is highlighted in the yellow box above.  To build a Vehicle Factory follow the following steps: 1) Select a Hovertruck by left-clicking on it. 2) left-click on the VehicleFac button from the Toolbar. 3) Place the Vehicle Factory by right-clicking on the playfield.  If the structure is green then it means that the location is inside the perimeter of the defense grid, which is good!  If the structure is red, it means the structure cannot be placed in that location due to collision.  If the structure is yellow, it means the structure can be placed, but it will not be protected by the defense grid.