Match both sides in the bookmatched pattern, and clamp it on a dead flat surface and use a bearing guided bit to trim it flush. Then with the top still clamped after the routing stage, hit it with some sandpaper on a solid backing. While you are doing this, save for a jointer. Owning a jointer and lunchbox planer opens up a whole new world of woodworking...
Modulus Mob #31
Eden Electronics Club #9