A large portion of the visible turret is sheet metal. I've seen a couple pictures from the May Day parade preparations where a seam is visible, and it's a few millimeters of metal. As far as I know, the shape of the inner turret hasn't been publicly displayed.
That said, I do think the Russians are heavily relying on their active defenses. The publicly claimed weight for the tank is very light for its size (it's slightly longer and taller than an Abrams, a tiny bit narrower, and 10-20 tons lighter depending on Abrams version). Assuming the weight is accurate, I suspect there's minimal passive armor everywhere except the crew capsule (which is said to have protection equivalent to 900mm of RHA), simply because there's not the mass necessary for heavy armor. If the actives (both the Afganit and the NERA) fail, it should be fairly resistant to single-charge HEAT warheads due to the armored capsule and the slat armor on the rear, but I'm less certain of its ability against tandem-charge warheads or KE penetrators.
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Writer at The Vespers War - World War I equipment for v2.2
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