Very Good, what kind are those pumps? I used to use johnson bilge pumps. However, the 3/4" water "Cap" was a little too much!
http://www.mindspring.com/~mkosem/pix/old_water/cap.jpg
Mind you this was 4 years ago. The technology of water cooling just wasn't as mature as it is today. But I had the coolest running Cyrix-MII on the block and the only one runnin 350mhz(100X3.5@3.2v).
By the way, I love the "BIGBORE" concept!
--Matt