I'm not looking at it in Illustrator with the ruler, but I think what you have will come out pretty good. The ends of those two points may not be as perfect and sharp as your drawing at this size, but it'll likely look fine at such a small scale. I think they'll let you know if it won't work. But be sure to mention it to make sure they're watching out for the concern. (They're not perfect as you can see from Group Buy 3... but not bad considering their technique.)