Here is a rifle i did recently using your stencil and also some comments.
I like the stencil it works well but it does not conform to the rifle all that well. Yes it was functional and worked but if you notice its not the hard digital lines you would expect.
Have you thought about doing instead of one big card with many patterns and cut outs on it maybe doing 4-5 smaller cards with patterns so they can be positioned in a more random manner?
Are you considering doing other shapes? I mean like skulls, bullets, Ron Burgandy's head and other random awesome shape.
Love you guys, keep it up.