Great job Phil - love the leg design - If the plans you used were free - would you mind sharing?
Since I drew them up, they are mine to give away.
Some notes on building. You will probably want to adjust the dimensions to fit your needs. When sizing for a specific pot, be sure to look at what ever water catch tray/plate that will be used. The only critical dimension is the width of the saddle dados. You must cut them to exactly the width of the cross piece. I used an exact width dado jig to make but there are many other ways to do it. I cut the mortises by hand but there are many ways to do that as well. I used a shop build taper jig to cut the legs. The actual dimensions are not important, just make them consistent. Glue each leg set separately and then join. I finished the leg assemblies before joining (see below). I used a wipe on oil based poly but any good outdoor/water proof finish is good.
One unusual point, I used a screw to join the 2 leg assemblies rather than glue. I was concerned about the legs taking a hit when moving and breaking the glue joint at the saddle. The 1 1/4" screw is from the bottom. Also, if your saddle dado is at all loose, that's a better way to go than gluing.