well we just tested our cooler set up for the first time yesterday and it worked like a champ!!
we got one of the round water cooler things from home depot, then got some 3/4" Copper tube, hose clamps, stainless steel screen, 3/4" copper T fitting, 3/4" Copper Ball valve, and some 3/4" copper butt fittings. we drilled the hole in the cooler for the spigot out to the right size, then soldered our copper together. inside the cooler it looks like a T and we have a screen on each end of the T. then we got an 8: diameter, 2" deep cake pan, cut a notch out of it to fit over the copper pipe, and drillled a TON of holes in it to acvt as a false bottom. worksd awsome! flows very well and was well worth the time and effort to piece it together.
It held the 14 lbs of grain for our IPA justr fine. However, it was too small for the 18lbs we used for the barley wine. the grain all fit, but the little water we added just got absorbed by it.