Quote from: Shadou on October 01, 2015, 06:48:29 AM
if I use walls to obstruct line of sight and force the enemies to come close enough to the turrets that the turrets can fire back, those same walls provide cover to the enemies to fire at my turrets from.
This is usually the biggest problem with killboxes. Some guns simply out range turrets. However, the raider coding was changed not too long ago - raiders ignore turrets that have no power. You can put a power switch somewhere safe where your colonists can activate it with no danger to themselves, and then on the other end of the power line from that switch, you can set up turrets that specifically have unobstructed line of sight on the position raiders use for cover to reach your powered turrets. Once the melee raiders are past these turrets and any long-range gun users take cover, turn on the power to the turrets that will decimate them from behind (just don't forget to cut them back off).
This also offers the benefits of killing fleeing raiders too for more loot (and makes them flee faster since you kill more of them quickly, which can reduce your repair expenses after raids).