I've had the same thing happen to me. That's really bad. No matter what you do, the days of having edges are numbered. Before you fix it, I would get the warranty rolling.
What I did:
J.B. Weld and some sort of structure to put in the massive hole. If you still have the missing sidewall that will be perfect. A shop may have sidewall material. If sidewall is not available, the toughest plastic piece you can find will do. J.B weld it into the hole and clamp it down for a day.
Honestly, if you want to continue to ski these skis I would bring them to a shop. The skis I fixed from this issue are rock skis.