Yup, a little trim to go and it should look great. I'm gonna go for white trim so it matches the ceiling rather than the speaker.
I lined the tweeter up by taking a string from the ceiling and having my wife hold it at ear level from the listening position. She pulled it tight and I used an angle gauge to get the angle the string created. I then cut the hole and built a platform in the attic that matched the outside angle. Took a few hours of hiking into the attic and back into the garage to refine my cuts but it was worth it.