You must have a huge knowledge of DIY type products to plan out all these things, everything u do looks so good!. If you happen to have time i would love to know how you sleeved those headers.
Pretty easy, just slide the cables thru the sleeving and heat up the heat shrink. You can find lots of heat shrinking guides in Google, I buy my heat shrink from performance-pcs.com
People have asked about the 250mm cooling fan. I posted Guide to installing a 250mm cooling fan in your case here
Put that PC in a small room with a window open and you have yourself a wind tunnel . Build is looking awesome so far, can't wait to see the finished product!