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Gregg,
You can repair this hole if you know a little about fiberglass repair. Start by grinding/sanding the edges on both sides of the hole to expose about 2" of bare fiberglass edge. Then fashion a back-up plate (heavy cardboard or very thin plywood work well) that is about 2" bigger than the hole but the same shape. Drill some holes in the plate and run wire through them so you can insert the plate inside the hole and pull it snug against the underside of the hole. Then cover the plate with heavy fiberglass mat (sometimes called woven roving) saturate the mat with catalyzed fiberglass or epoxy resin, insert the plate inside the hole and use your wires to pull it snug against the inside of the hole. Tie off the wires to a board placed over the top of the cockpit and let the resin cure. When cured, the hole will be plugged from the inside. Snip off the wires, rough sand the patched area with 80 grit sandpaper (a palm power sander works well) and they lay up layers of figerglass mat and cloth and resin to finish the patch flush with the inside of the cockpit. If you are using fiberglass resin, your last few coats can be white gel-coat that you can then fine sand down for the final finish. If you are using expxy resin (stronger than fiberglass) you cannot use gelcoat as the gelcoat will not bond well to the epoxy surface. Instead, paint with a paint designed to cover epoxy. As all of these products are heat sensitive, your work area should be warm (say 70 - 75 degrees) and dry. If the area is too cold, the resins will never cure and remain tacky. Been there/done that. Also make sure your work area is well ventelated as the fumes can be nasty.
The other cracks shown in the photo can be repaired with fiberglass or epoxy resin and fiberglass cloth a described above.
Good luck with this project.
Alan Glos
Cazenovia, NY