I am familiar with everything and i know real source of Chinese mighty indigenous tech like i know for india. and no buddy you are not close but you lot are doing great and may close the gap so congratulations.
It's not just engine propulsion....even in metallurgy materials science , miniaturisation, electronic, real genuine inovation etc you are behind even to next door Japan and russia forget Europe or Americans.
Yes that 2 billion is better spend getting know how directly from manufacturer himself ( TOT ) lol.
It's not about what technology you have but can you work on the know how you have and build something better , improve inovate. Chinese have shown none. Only Japanese have in asia so far.