I am located in south Florida. I checked the prints and they showed two different cross sections - one with a bond beam, and one without. I called the engineering firm and they said that with an overpour deck, there is no need for the bond beam. If we had coping pavers or tiles, then it would require the bondbeam so that the deck had something to tie into. As it is, the rebar will be bent 90 degrees and become part of the overpour deck.
The walls are only that thin right at the top - 4" which is called out on the prints. As you go down, the black plastic is bowed out considerably and it gets a lot thicker. The bottom came out to about 14".