There is clearly more than 550 mm width available on the turret top besides both the crew hatch which measures 550 mm,
That's why our pixel measurement gurus wont touch this photo with a barge pole,
as it will clearly demonstrate there is enough space for composite armor besides the crew hatch in turret design,
How much of it is occupied by the armor must have been classified.
Close to six times width of crew hatch (550 mm) is clearly visible as the turret top width from this straight on photo,
That's why our pixel gurus are carefully negotiating around this photo, and not producing any pixel magic on it,
Like a higher ground pressure T-90 negotiating away from the swamps they will avoid measuring this photo,
But they will use this photo to measure face widths (that too chinese face width)
So much for their professionalism.