For those who are thinking Pakistan is going to give up critical KAAN techs to China, I humbly urge you to consider the fact that, in international strategic defence cooperation that's not how things really works.
(Also, There is a misconception that Pak has increasingly became a vessel state of PRC. But anybody with decent understanding of subcontinent's politics or Pak state would knows that is not what Pakistan's actual problem is.)
Anyway, it doesn't matter if Pakistan assemble or manufacture the KAAN's fuselage. Like F-35, KAAN is an in-and-out software defined platform.
Italy and Japan both has F-35's local production line, yet they cannot even control a bolt without US permission.
There is a saying that USA doesn't sell the F-35, it only sell sorties.
You can expect Türkiye would assert similar control of KAAN when exporting aboard.
The main issue is, for now Pak has absolutely zero money. (Like literally) So i don't know what their contributions would be in the near future.
(Maybe their engineers would work for free?)