[Lmackattack]

I prefer to place tape around the sleeper and use this as a guide for my cut. Then a thin cut off wheel with a dremel tool to cut the roof off. After its cut use a small palm sander or file and smooth out the cut line. . Do the same with your roof. After you get smooth straight cuts glue the roof back on and glue supports on the inside for added strength. I use tamiya putty for the body filler and then high build primer after it was sanded.