I'll post a picture tonight. I dont' have any UGCs within reach at the moment.
Also, it's worth mentioning that while most Atari 2600 games are the same size, some are different. Cosmic Arc and Kool-Aid Man are two examples that come to mind. They are a little bigger and would require different modification. I'll post pictures of the games I own which are sized differently. I only mention this since I assume you are thinking down the road for Atari 2600 cases. It might add a slight challenge.