3/4 will be plenty strong as compared to the original coring. I redid all my floor with marine plywood and it is rock solid. Just build up the areas that support the hatch where it sits on the stringers so you are not spanning more than the with of the fuel tanks or center section where the muffler resides.
hard to tell from the pics but the exhaust hose looks like it has a few hours on it. If questionable replace it as it is below the waterline and a blow out here will have you headed for the bottom in a hurry. Use some good clamps like Awab and double them up.
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