Good.
Now run a search for the XJinn waterblock: it's a multi-layer cross-drill design.
As for mounting it, nylon screws might be an option, but you'll have to spec them out carefully, because those pressures are above what a normal nylon screw can handle. You could use many of them.
Otherwise, you ought to look for a large heatsink, and that doesn't mean that the heatsink must be meant for a CPU
. Check out various shops, like
www.allelectronics.com www.mpja.com www.mouser.com www.digi-key.com or whoever you can think of.