I fly for a living and have had a few lightning experiences. When in the Navy, I flew P-3's. Had one struck on the nose radome. Blew a large hole in the dome then the energy skidded along the cabin floor. When it exited the tail, it blew the entire 13 foot long boom off the tail. The electronics were never the same. Had an airliner that took a hit. Only found a tiny pinhole in the main cabin door. A thouough inspection revealed no problems except one of the control cables that had burned through all of the wires except a couple. These would have snapped in flight if they hadn't been discovered.

The boat hit by lightning obviously shows traces of arcing. It's hard to tell if other parts have been damaged but it certainly pays to make a close inspection of any part that is subject to stresses. Cables and hardware would be suspect.