That trim will work, since it's a RVL-40. The button you have circled is the eject button, which will not be used if you do USB/SD loading of games. As gman said, make sure to sand the edges well. It would also be a good idea to mask off the board with some painters tape or something, to ensure that no metal dust gets underneath something, as that can cause problems.
Also, if you want, you can cut more off. The board pictured is a high enough revision, so it will work with the guide gman linked.