The size isen't the issue, but the level of sohpistication. When the pr. 1135 emerged it presented a huge technological cap to its precessors, pr. 50 and 42 classes. Untill these ays NK hasen't showed anymore sophisticated shipbuilding than for the level of the mentioned forerunners of Krivak class.
As the ship seems to be stripped out of its equipment, I'm more and more douptfull of it ever being operational. North Koreans haven't showed any indications that they could master gas turbines, complex radar and sonar suites, automatic naval guns, SAMS, modern SSMs and ect. In the best DPRK could make the ship running with diesels and with post WWII era gun armament (and perhaps silkworms) so it definetly wont reach even near the Krivaks capability which was new in the 1970's...