I feel like if you want a stiffer hull there are lighter and more effective ways to stiffen it. Monolithic glass is very strong but kinda flexy. Don't worry about the thickness or being able to see through the thin gel coat, that doesn't matter.
A couple foam and glass stringers on the hull side in the areas of the most flex will do more to stiffen it up and be lighter than a couple layers of glass over the whole thing. Yours is an MA right? Put in a few vertical knees where the rod holders were (if you're not putting them back in) and run a stringer horizontally along the hull side half way between the chine and the sheer line. Use foam or ply and make a 1.5x2" strip with a nice round top. Glue it in with a nice fillet, then glass it over with two layers of 1708 or three of 1208. It will be WAY stiffer than if you just glass the whole boat, at 1/4 the weight and expense.
Didn't do any of this on my MA. I just glued/tabbed the new floor to the hull (which essentially creates the stringer I mentioned) which ran about 4" above the chine. And I glued/tabbed the casting platform and aft motor well molding to the hull. Also glued in the rod holders and fastened them securely to the deck cap. The boat is stiff as shit, was out yesterday in a little chop and it is way better/stiffer than before.
Don't underestimate the stiffness that tieing all the interior into the hull will add. If your boat is anything like mine, the interior molding was never actually bonded to the boat in any meaningful way. Bond it to the hull with putty (properly) and glass, and that monolithic glass hull will stiffen right up.
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