Yes your bang on you have to do two cuts ideally as shown in the hasfengen build thread, you also have to cut it under the front indicator as that piece is nearly 2 inches wider at the bottom of the arch.

Used templates off of the wing I bought so just need to flip it over to do the other side, lol sounds so easy, but was really happy with the results, it needs a tiny bit more work but its pretty smooth and uniform, as said never done anything like it so happy with it.