Hey everyone, new to the forum and somewhat new to woodworking. I've been working on a project guitar that's going to have a recessed plate. This one's kind of a guinea pig of a guitar so it's built from plywood. I did a rough cut with a router at a depth of 1/32". As you can see it's a bit rough, which is fine I can sand it, but I was wondering how to get it closer to the guidelines I've drawn and even it out so it's not so jagged and uneven around the edges. I was thinking a flat file may be the best way to tackle it. Thoughts?