I wpuld say number 3, 4 and 6 because they can shoot in an angle of 360º and makes the feeling of better secured and more realistic. If you have a fortification like number 2 that only 'can' shoot everything that is in its front will later look a little bit of silly if the enemy is behind it and the bunker stil can shoot at its enemies. But as usually I love your concepts!
I wpuld say number 3, 4 and 6 because they can shoot in an angle of 360º and makes the feeling of better secured and more realistic. If you have a fortification like number 2 that only 'can' shoot everything that is in its front will later look a little bit of silly if the enemy is behind it and the bunker stil can shoot at its enemies. But as usually I love your concepts!
这MOD烂尾了?白瞎这么多好模型