I have had the problem with the turret as well and here is how i fixed it. The turret got rotated somehow and you built it while it was rotated. to fix it select the turret then click rotate then right click on the rotate button. if it says like 90 in the X axis then you need to set that to 0. The turret now looks like it is on its side. Now select it and make it where you can select all the vertexes and then rotate it 90 on the X axis to put it back on the correct axis. Whats left is you might need to adjust it to where it looks correctly on the bottom of the turret.
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