[Dwight]

Buy a fiberglass repair kit from Wal Mart or auto parts store. Last one I bought cost $8 or $10. Apply 3 or 4 layers of duct tape to the bottom of your over size hole. Make sure to clean it so the tape will stick. Cut 4 or 5 pieces of mat to fit the hole. Mix the resin per the instructions, pour a little resin in the hole and lay a piece of resin soaked mat in the hole. Place all the pieces of resin soaked mat into the hole. Build it up so it's at less even with the fiberglass body. Pour resin in any small holes. You can use foam rubber to push the resin/mat around. It does not stick to the foam. The thin latex glove will keep it off your hands. Tape around the hole will make clean up easier. Let it dry over night, sand and cut new hole. If you mess it up, cut it out and do it till you get it right. Small pin holes can be filled with body filler. You can experiment on a piece of glass or metal before you try it on your car. You can always cut or sand off your mistakes. It's not that hard. Just takes time.
Let us know how it turns out.

Dwight