So to make things clearer; in this scenario most of the region North of the Perlemian Trade Route is fully Sith controlled aside from regions near the Tion cluster. There is also a large buffer zone of the territory near the capital Coruscant that extent between Tython and Zeltrose giving the Sith Empire more industrial power and defensive borders.

  
The major economic hubs of that this Sith Empire would have would be Coruscant, Alsakan, Candrila, Empress Teta, Muunilinst, Balmorra, and Kuat (which would be where most of the ships would be made)

  
The major force Hubs in the region would be Malacore, Korriban, Dathomir, Dromund kaas, Yavin 4, and Tython.

  
In terms of size I am pretty sure that this would make the Sith Empire above smaller than Vitiates, the Brotherhood of Darkness, Palpatine, and Kyrats, but in terms of industry and population it should be above The Brotherhood and the SWTOR Sith Empire.

  
But what would you say, the military and economic  might of this empire (looking at territory owned alone); would this Sith realm be able to beat the rest of the Republic Rump state in a fight or get crushed in a long war?

How powerful would a Sith Empire that controlled the Galactic North be compared to the other major Sith Empires that existed.