I have it on good authority that this crash was indeed pilot error, and in fact, she forgot to put her gear down. If you go through the picture sequence, the facts presented in the photographs bear this out as well.
As she settles in, you'll see she's configured dirty (except for gear), and slightly nose down, preparing for flare on landing. Once she realizes she's forgotten her gear, you can see where she adds power, lifts the nose, and pancakes in. An unfortunate error, but an error all the same. The pic of the inside right side of the cockpit was taken AFTER the plane had been lifted off the ground with the crane, and the gear selector lever was placed in the correct position. Sometimes, knowing the right people can answer a lot of questions.
Estimated cost of the overhaul is about $80k, assuming there aren't structural issuses inside the wing or fuselage.