You get 2 points for a turret i believe and you get -2 points for a team kill. Trust me; I had a bad experience with that on Polis Massa with Darth Maul. I had the troops set at 750 per side and my grand total was -234 points for the battle.
If you are trying to do the defend the refinery section, I found that you can repair the main door if it is destroyed. Just be an engineer and fusion cut the panel to the left of the main door. That should keep all vehicles out. Hope this helped May the force be with you.........