with stolen blueprints and unlimited govt resources, easy as pie...
Not really. After the collapse of the Soviet Union China bought complete blue prints, working models and the time of engineers who had designed Soviet combat aircraft and I believe other military hardware. They still couldn’t replicate them. A tool chain and manufacturing ecosystem is a unit. Industrial espionage is useful but it’s not a way to leap frog 20 steps, maybe four, ten if you’re both lucky and good.