Its a common problem when you build a vehicle inside the bay. You have a vehicle and you need to move it up for some reason. Simply add a cube under it and place big gun on the facet opposite to the ground.


On the figure you can see two white cubes which were added under the vehicle. There is one-cube-space remaining between the ground and the bottom cube. You can see thin facet on which a railgun will be placed. You have to aim it very precisely.


After placing the railgun the job is finished. Car was moved up.

Unfortunately this procedure does not work for moving the vehicle in a horizontal direction.