I had an Auto-Cutter, and used it successfully to open a few sets of doors on models, but you had to be careful, and work slowly, or it would overmelt the plastic, making a big mess! I remember using it to cut the front clips off a 58 Edsel and a 57 Ford, then grafting the Edsel clip to the Ford. I stopped building model cars in 1971, and used the cutter with a different tip as a soldering iron till about 2002! Sam