I was in the keys not to long ago and stumbled upon something similiar on the bay side...here are my observations
They used primarily drum roll.......
shopping carts yep thats right some piled 5 up, oil drums, cinderblocks, brick rubble, and some lobster motels (just a bunch of PVC pipes strapped together).
It sat on a sand ledge drop-off that is it was about 8-10 depth in sand grass bottom and it abruptly dropped to 15-18' sand- rocky- early growth vegetation...current was pretty strong compared to the top, and fish were plentiful as well as bugs

...if you decide to refe fit up do it ninja style preferably at night else some one like myself might pinch it

Good luck playing Mama Nature!