check my gallery for the Heavy Duty waterblock
its made to fit LGA775, with the top cut out of 90x90x10 piece of acrylic/lexan (though delrin or brass would work perfectly fine), and the base a 70x70x8-10 block of copper, channels 6-8mm deep. i suggest upscaling the 90's to ~100's and 70's to ~80's for LGA1366. (hole spacing is 80mm on 1366, vs 72mm on 775)
having the holes for both socket types for bonus points
all bolts would be M4 (i prefer the metric system)
the barbs are G1/4, but you may want to make the middle one G3/8, in case the block is copied for some of the flow-nuts amongst us.
the main point of this design is the S-channel thats cut into the top, rather than the base, allowing pins to be machined. (this with a standard mill in mind)
if you look closely, the base is machined to accept the walls of the S channel in the top.
if you choose to make the top out of plexi or lexan (polycarbonate), 5mm holes for LEDs for bonus points
the copper and plexi parts of this block are chamfered as to not interfere with the mounting hole position, not just
the little details... well, just see how it fits for you, i dont care much about that.
if made for LGA1366 i have interest in having it shipped here, as i *may* build an i7 rig next year.
pics here and the 3 next.
if anything is unclear, i can try to remodel, taking LGA1366 into it.