Drof
Nice job on your holster. My first holster sure didn't look that good.
As far as patterns, Mike (Twinoaks) about covered it. I would like to add the following: After I trace the pistol outline onto the file folder, I carefully cut out the outline of the pistol. If you centered the pistol sights on the folder's crease and carefully layed the pistol on it's side, traced around the pistol, then cut out the tracing, your cut out pistol pattern should automatically compensate for the thickness of the pistol.
I can then use the cut out pistol pattern on as many new file folders as needed to achieve the holster design I need.
Randy