screws -- after all the labor , expense , weight of f'glass over wood ...-just buy aluminum diamond plate and a little framing for it, rivet or screw it down.
-lighter, cleaner, longer lasting..more professional looking to boot
There is a compound called penatrox 5 A that will go a long way toward keeping down the corrosion from unlike metals. I don't know if it is available commercially. Lockheed used it on Navy planes years ago.