I wonder if some chinese technical people just left boeing with a raft of trade secrets. Nah.
They didn't have to. Al Gore probably already gave them the plans.
They got the plans & frames needed for construction and dies for some of our older model planes during the Clinton administration.
That was part of the Chinese connection with Loral and the large political donations (bribes) that occurred. Everyone forgets so fast with the rush of info coming through the computers every day.