Last year, I built some sub-irrigated planters (SIP) using the excellent 2-bucket design from Green Roof Growers. The concept is based on the commercial product, Earthbox, but costs far less to build at home.
You're Mr. Lebowski. I'm the Dude. So that's what you call me. You know, that or, uh, His Dudeness, or uh, Duder, or El Duderino if you're not into the whole brevity thing.