These pics are looking forward. If the deck coring is still good, you can screw right into the deck. It's approximately 1/4"of glass, 3/8"+ plywood coring and another skin of glass on the underside yielding about 3/4" of substrate. There may or may not be enough room to use toggle bolts, (I'm thinking not). I would 5200 it down as well, unless you're going to do other work later which would require removing it. If I hadn't raised my deck, I wouldn't have a problem screwing through the deck into the top of the stringer. Good luck!
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