My first reaction is that the hulls are toast. If you were looking to buy this boat from some one else, I'd tell you pass this opportunity like it was smelly garbage. But, that's not the situation. You already own it, so it's really asking now what?

If you plan to race it, you need to replace the hulls. But, if its just for fun and giggles, then you are just looking for the cheapest way to get this boat sailing. You could just sail with soft hulls until something snaps, then duck the falling mast and wires.-Cheap, but a bit risky. Think of the story you could come back here and tell! And take pictures of the aftermath. We all just love those pictures.

If you can find a cheap source of epoxy, it would be worth an attempt to repair the hulls. But in the real world epoxy ain't cheap. It wouldn't take long to exceed the price of good used replacement hulls. Maybe you could find a supplier with "past the expiration date" epoxy for cheap.-It should still work for your needs. I don't know how large your soft areas are, but I'm going to wildly guess you will need 3 gallons of epoxy to do 3 sides. The repair is not usually pretty, but is functional for recreational sailing.

If your soft spots were just on the top forward part, I'd say try the injection repair. But any more than that requires serious thinking and special circumstances to justify the attempt. (-such as an outrageous deal on epoxy.)