JD,
Yeah, quite right about the currant card you have. But the instant I saw the idea I was thinking in terms of a 9800 Pro most of all if O/Ced.
Tex707,
I don't see why that would be impossible. But what if the hole being drilled from the water chamber were drilled on a drill press with a tiltable table. Or could be done by clamping the Lexan in a drill vise. Then you could drill the hole on a slant and avoid the 90 degree corner. Instead it would be say 65-70 degrees, saving a bit of flow for you while still allowing you to have the side mounted barbs you are making use of.
Anything to avoid 90 degree bends!