Step 1: Acquire the barrels
Step 2: Barrel Orientation
My thinking was that I just didn't trust the thickness of the sidewall for a tap in connection since I wouldn't be able to thread a nut on the backside, so I went with a connection into the bung plug, thus needed an upside down orientation.
This provides for the barrel to be completely emptied, unlike most with a side spiggot - but also required me to build the base platform to elevate them slightly for the plumbing.
Since they store on a second story I had no issues of elevation to accommodate a watering can either so the base was fairly routine to build as opposed to one 2' tall.