I would not buy a top from China with your money, especially if it has a Z in the name. After all the people were ripped off by Zeintec, Z-Art and the other members of the South African/Swiss/Canadian Boxster to Cayman conversion debacle/scam family, I am amazed that your collective memories are that short. And to think that cheaper is better is folly.
There is only one manufacturer in the world that I would buy a top from and that is in the Netherlands
Porsche Boxster ombouwen naar een Cayman-look - MHautomobielen.nl prepare to pay a lot but you will get your money's worth from what I have seen.