I think, they are well prepared for mass production and they can build as much as they need in one year. They still do not need them at the moment.... thats overall around 10 medium sized helicopters in a 10 year period or about 1 per year ...
At the moment they build things that need a long periode of time. Some day in the future they will start to build all the things that do not need long. The Chinese armed forces will then grow very quickly from mediocre to outstanding. This has the advantage that until then the suspicion of the world community is not directed towards China.