Also, are you using parity or mirror for your storage spaces setup? If using parity, how is your performance? I had read that parity suffered from poor read/write speeds.
Awesome build! I've been looking for a case for a NAS build for months, and this one looks perfect. I did a quick search, but I couldn't find that case available anywhere. Where did you purchase it from? Where did you buy the hot swap backplanes?