Just got done building my mash tun this evening. It's a 12 gallon igloo cube cooler. I used 1/2" PVC in the bottom to collect the wort. it took me like 2 hours cutting all the slots with a small hack saw by hand. It's gonna work good. might have about a quart of deadspace. i would post a picture, but i'm on dial up and would take like forever. I used a hose barb through the hole where the original drain was, gasket on the inside, a 3/4" to 1/2" conduit washer, then the threaded female to glue female pvc adapter for the collection circuit. i might incorporate a thermometer through the side. just gotta figure best way to seal around the probe.