I was just thinking of for example a plane with a damaged undercarriage but no spares to repair. engines used to replace others damaged, then instruments and cockpit panels. Pretty soon you have a hulk of an airframe that is very difficult to move and no one knows much about. Some models like the Do 17 and Ju** were being replaced by more up to date models which would hardly be worth the time restoring.Interesting idea. I doubt the Germans would do that. I guess they would cannibalise aircraft but would not write them off but put them up for repair.
Kris