It's the only way they can make the whole case clear, is to use that Acrylic material. Just like our clear side windows on most of our gaming cases.
It is not as light weight as aluminum, but it is lighter than steel cases. The case may come in pieces and you'll need to assemble it. Also, acrylic isn't a very good heat conductor and therefore sufficient airflow is a must. But it looks damn hot.
*Fact: Microsoft Window's Blue Screen of Death vs Computerforums.org's White Screen of Death. Which is worse?