On a cloudy and blustery day we ventured to our local Lowes, got the remaining pipe....that I forgot....and the plywood for the deck, and tied into building same.
Since so much of this construction is experimental, we're constantly rethinking things. I'd intended to use this really very clever scheme using stainless steel rings and 600 lb test nylon webbing to hold the barrels in place.
....didn't work. We wound up tying them, which will be inelegant, but fine.
So here's the method:
First, you start with your pet barrel. It's my pet barrel because it followed me down to the worksite....and very nearly into the alley, across a parking lot and into the side of a lurking Police car, but I digress.