Pat note also the roof and other parts of the T-14 you will see rivets similar to the ones you were pointing out on the NK vehicles
ALSO if you watch that video at the end the close ups of the T-14 have a "tinny" look like the NK "tanks" on parade and my feeling on this is what we might be seeing there and on the NK tanks is a thin protective skin over the composite armour AND the "rivets" are in plain view
Finally.............ANY armour values we assign to this and virtually every other MDT are estimated and ask 100 people to submit their estimates what you are going to get is
100 different estimates
So "fine tune" to your heart's content it is just one more "opinion" based on pure guesswork and the only way we will ever get hard data for it is when someone puts a hole in one and true experts fully evaluate the hulk AND THE TRUE DATA IS RELEASED.
It is also leaping to conclusions to assume that because the T-90M employed SOME OF THE T-14 armour elements on the sides and turret means that converts 100% to the armour on the T-14
The same has been true for YEARS with the US versions of the Abrams...... all guesstimates