i made one from a 5 gallon igloo cylindrical cooler. i would have preferred the extreme version but i hadn't seen it until after i got this one. it has a cpvc manifold that seems to work well.
the second time i used it, i put together a belgian dark strong grain bill. on brew morning, i realized that 18 lbs of grain and 4.5 gallons of water were not going to fit in a 5 gallon cooler! i grabbed my big "ice cube" cooler, the one that we use as a cooler, wrapped some teflon tape around some hose, poked it through the drain with the manifold and it worked fine. every time i open that cooler now, i can smell the malt!