If its close to the edge you want, you cant beat an electric shears. The one in my picture cuts flush with the edge of anything. You can trim off any amount, from 1/64 to any amount. You can start with a sliver of an edge or start in the middle of a panel, with a starter hole. The cut is smooth with no chips. The cut is easy to control and curves are no problem. And unlike the chips from a router, the waste has value, aluminum is at an all time high.
Brwbier