I don't think it was a preproduction vehicle. My thoughts are that they probably had most of the kinks worked out of the vehicle, and then added the already tested turret. Of course, that's why I'm the team weapons sergeant and not the team engineer.
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The oddly shaped cutouts on either side of the turret near the pivot point area are absolutely correct, along with everything I had time to look at. (my connection is EXTREMELY slow...)
From looking at the photos, without actually having the kit in front of me, everything looks dimensionally and proportionally correct. I have no explanation for the hatch errors - they are very noticable. The one on the top of the turret does'nt look to be an easy fix. It's going to involve a little cutting and filling.
As for the missing weld seams on the recoil mechanism housing, perhaps they chose not to use the highly vaunted, and age old method of using slide molds, which would cost a bit more. But, as I said, adding the welds will hide the prominent gaps you see on each side of the housing, as they are in the same location. Other turret welds are missing as well. Perhaps they just wanted to leave something for us to occupy our time with.
The overly large bolt detail is something we've learned to accept from more than one manufacturer. I must say the sight on the left turret looks very good. My photos have it open (which is by far more interesting) but the overall shape and details are spot on.
I wish they had added the rear hull plate, but I guess we'll have to wait. At least by leaving off the hull armor it's easy to see that the left hull hatches will be correctly flush, and that the hinges will be correctly recessed.