Here is a template that I drew up for a standup Centipede Arcade monitor bezel as I couldn't find one anywhere. It won't be perfect but it's a lot better than having nothing. I just used poster board from Hobby Lobby. All the areas marked in green I scored with an exacto (not all the way through) and the red lines are crease lines without the scoring. Then bend the flap (top right) and use a little elmers glue or wood glue to attach the flap behind the front facing poster board.