I built this one a while back, flipped it upside down and used the spear port with a 2" triclamp elbow and valve, had a friend weld a 4" triclamp ferrule to what was the bottom, and a 1.5" ferrule as the racking port. All in total I had under $50 into it but i was lucky to get a lot of the fittings from work for free and my friend welds for me for beer.