When you guys talk of the turrets moving independently of one another, you're speaking of the entire piece that comprises the gun and viewport, right? That had me confounded me as well, but - for better or for worse - it's "addressed" in the new cross-sections book:
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That picture of the yoke however, is pretty revolutionary stuff, engineering-wise. I admit I kind of don't understand it; it almost acts as though the main support tube would come through the hull in a vertical fashion (as opposed to front-to-back as before), and then the yoke is now pivoting on that tube (or the whole tube is pivoting...to get to 90 degrees regardless), and then the cannon housing itself is of course allowed to pivot on the yoke as before.
In the screen shot it looks as though the main tube is more or less longitudinal than vertical, but it's hard to tell; so is that in fact what's allowed to articulate, and it stays inline with the yoke? Gah! It's such a serious departure from the old-school Falcon. Wish I could see a mockup of it up close.