Is it supposed to be the "PZ-Z70" as opposed to the "PC-Z70"?
Point still stands though. You sound disbelieving but you should actually compare a case by LL or Silverstone, and a case by, say, NZXT or Coolermaster. If production facilities are as accurate as you say across the board then why do you get shoddy products in any sector?! Most companies have poor quality control, and their manufacturing simply isn't as good as others.
Any one who purchases that snail thing deserves a punch to the face in my opinion.