[Creeper]

Measure twice (or more like 5-6 times), cut once. I get what you want to attempt. Before you go a-hacking though, study other work, measure and consider the ramifications.
If you've not stippled a polymer before, get yourself a good, temperature adjustable, wood burning or pencil soldering iron with assorted tips and some scrap plastic. Use enough heat to displace the plastic without turning it into a puddle.
Don't touch the gun until you've got something you like on scrap. Use a silver Sharpie and draw the pattern directly on the gun... don't "freestyle" it.
You can sand the plastic to create a different look than just raw stippling. Acetone can be used to soften, shine and smooth a surface.

That's it... have fun!