Seems pretty straight forward except the part about the baby ducks jumping six feet out of the box, must be little rubber buggers.
The part I hate... It's gonna be tough watching the ducklings dwindle to zero after they hit the water. The survival percentages are pretty dismal. Yes, I get that is how nature works, still weighs on my heart. I seem to have a lot of predation around my place too, racoons, coyotes, feral cats, hawks.
Jeff-
6 feet is nothing. I have a pair of wood ducks that nest 30' up in an oak tree in my back yard. The light, downy ducklings aren't hurt at all by the fall to earth.
I wanted woody boxes too, but I think it hurts more than helps when you have LMB. Their chances are much better nesting elsewhere.