The barrel water feature has never caused me any problems, it's glazed on the outside so it doesn't leak. All I did was cut a whole in the bottom of it (it's terra cotta so it's easy to cut) and my gravity fed filter goes right into the back of it.
As for the prefab pond I used a piece of 2" pvc as a spill way so the ponds are connected. It wasn't really my favorite Idea, but it's what I had and it worked. Also it works well as a settlement chamber ( didn't plan that, but I like to take credit for it :lol: ).
By the way I also have a fire pit just out of sight. I just felt like my backyard wouldn't be complete without one.
-Kyle
P.S. Thanks for the nice comments everyone!!