So I posted this over on [H] and thought I'd share over here too. The block actually works amazingly well...a few degrees cooler than some of the DangerDen blocks that I used to own. I made this a couple years ago when I was in college and had access to a CNC machine...

Here is the raw copper I started out with:


Here is the milling machine going to town on my block (I designed it in autocad):


Here is the block after being freshly milled out!


Here is the clear acrylic top that I made for it:


The bottom block and top cover:


Here is the block assembled:


Like I said...it performs very well IMO, for my first go at a waterblock. You can see the fins in the channel to help dissipate the heat. You can also see the dimples I made in the bottom of the channel to increase surface area and to also create some water turbulance. I originally designed the bock to fit my 478 p4. I have since modified it to fit my q6700 quad. Keeps my quad nice and cool even under full load!

Just thought you guys might enjoy these pics!