I have to go out right now, and don't have time to read most of the recent posts, but there are two points I'd like to make before you start constructing anything.
First, never add rocks of any kind to soil. They all inhibit drainage. They're impervious to water, and will reduce the area of soil available for percolation.
Secondly, never place soil against stucco, even if the stucco appears to be below the level of the concrete foundation. Stucco is porous, and it will carry moisture upward similar to a sponge. Build in some sort of air gap between your bed and anything that is not bare concrete.
I'll check back and read more when I return home - I did see that someone addressed the stucco issue to some degree.
Ken
Don't
