Oh man, I've done this so many times that I feel it is just part of being in the hobby. A lot of the suggestions previous are right on. I collect all and as many pieces as I can and at the field while feeling like the biggest dork, I start to clean and sort everything. I brought my Avistar back so many times, probably more than I should have. I will admit, I have a lot of building experience. So when I have to come up with for example a rib outline to make a fill in piece that I don't have, I can come up with it. There are some tricks but you learn them with experience. But yeah, cut back the Monkote, and start figuring how you can piece it back together. Thin CA can do wonders, but sometimes epoxy is necessary for those really strong bonds you need. The best suggestion I can give, is you have to just try. I see too many guys just strip out their radio and engine, making even more damage in the process and then putting the remaining hulk in garbage can out at the field. I've been tempted many times to ask for the remains, knowing that I could put it back together. Sometimes it's just fun to bring a plane back from the dead just to show the guys it's possible. I even like to go to the extent of using the right color Monokote to even match the original color scheme, and see if anyone even notices that the plane has been rebuilt. So my suggestion to you is go for it when it happens. One thing I've learned that fixes are usually less expensive in money or time. And you know something, it just makes you a better modeler.