I recently started reading through guides and posts etc on bit-tech and decided i was going to make my own GPU waterblock. I have an XFX 8800gt with a really really loud fan so i figured it was time to get rid of it. I'm a complete noob at this kind of stuff, so helpful advice would be much appreciated. I'm basically wondering what size barbs i should use and whether or not i'd be able to use an air cooled heatsink and convert it. So far my general plan is cut out the heatsink shown in the red (please forgive my poor annotation skills ) as well as all the the stuff inside the channels. i'm then hoping to re arrange to pieces of copper to create turbulance throughout the channels up until the final channel leading into point B, to restore laminar flow. Is this a ridiculous idea with no hope of success?