Can you please confirm what are the MINIMAL documents required to apply PRC Z VISA in Hong Kong?

I think you must have some misunderstandings. If you don't get the work permit, you won't get the Z type one. Your employer will assist you to acquire the work permit. By the way, I am not sure that if you can still aquire Z type in HK now. It's said that it has become difficult to acquire it there after the new regulations take effect.

I hope its still possible to get a Z type in Hong Kong. I am planning to go there next week. Any websites you know of with up to date info?

frist you can find a job in hongkong,you can apply for the Z. second ,you have office in hongkong ,and your office have 5 local stuff at least,then you can apply for the Z!