Well Steve is partially right and since Scamp's don't have a frame that leaves fiberglassed perpendicular to the body.
Did someone remove the one from your Scamp
or is it badly damaged? Because this one piece totally supports one complete side of the upper bunk, you'll need to be completely confident in your ability to properly fix/replace the piece. Otherwise whomever is sleeping in the bottom bunk may be injured by a falling bunk and the body in that top bunk.
By the way...WELCOME to FiberglassRV, we're glad you're here