For 30years CCP improvished its people even when Japan, Taiwan, South Korea became developed nations only china and north korea where stuck makeing cheap Mig-21 clones. Just as with Mig-21 clones same way CCP was only makeing Russian clone missiles. They are all reverse engineered.
The blue print does not mean a blue paper like that of a ship..lol you dont even know that. It means stolen data and NUMBERS on all specific parts and details. India can build the kaveri engine but it does not have enough thrust becoz of specifics like the blade design and small details that improve thrust, for which we need NUMBERS which will tell us exactly on how much is the angle required for the blade. You wont get all that, dont rack your head and live in denial.
I will ask you a simple question, why does the truck look the same? why cant they build a diffrent looking truck, why one which looks exactly like Topol? Because it is a blue print copy, if you change one thing you wont know where the next bolt goes.