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I would go the aluminum route too. I worked in fiberglass hand layup for many years building motor homes and sailing yachts. It's itchy and messy. A simple access panel will look better, out of aluminum. If you need to build a small part, (I did a fan shroud) make a mockup (plug) out of wood, spray with 3M sprayable body filler, sand with 400 wet or dry. Polish and wax the plug. Gelcoat and lay the fiberglass. You will be making a mold. Pop the mold off the plug. polish and wax the mold and you can make as many copies of the part you need. Maybe even sell some.
By the way, If anyone needs a fan shroud, I have a nice mold.
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