I made one up for a previous CAP unit out of corrugated metal. If the Wing has a glider, that presents another option. Trailer it to where you want the target to be and don't attach the wings. If you really want something that replicates a real crashed aircraft target, any pile of metal will do. In many...maybe most.. of the incidents I have been involved with, the crashed airplane did not resemble an airplane in any definable way anymore. Big ball of aluminum. Metal pieces strewn about. Sometimes pieces of wings and empennage. All of which can be easily fabricated with sheet metal, plywood, and paint.

But please, don't play "I've got a secret "games. If this is being asked by a cadet -- which I suspect -- then just say so and also loop in your relevant senior member, like the Squadron ES officer.