Beg to differ, but the mold is on its side. They spray the gelcoat, rotate the mold to the other side, spray the gelcoat, and when it is cured, they start laying the resin, roving, and glass sheets. Transom gets added along the way. The mold gets rocked from one side to the other as they build up the hull from the outside in. Once cured, it is popped out of the mold and put on a wheeled dolly. Then the stringers fuel tank, and cockpit sole get added,. Once the hull is finished, the gelcoat we see on the inside of the hull is sprayed. So the gelcoat we are looking at was sprayed when the hull was right-side-up. It certainly could have pooled.
The deck (cabin, gunwhales, etc.) get built upside down.
I'd still check the outside for evidence of a strike.