Nope, it was so much easier than that. I was originally going to do something similar to that to make the label image and just Photoshop it onto a picture of an Atari cartridge. It'd have to be a straight-on shot, though, because I'm totally incompetent with Photoshop. Changing the label font would've been a matter of finding enough label images with all the letters I needed. But when I hit Google for images, I found this
Now, I was still going to just Photoshop the label onto a picture of the cartridge, but...incompetent as I am, I couldn't make the rounded corners transparent instead of white. So I decided it would be easier to print it and attach it to a real cartridge. But I didn't want to ruin a real cartridge, so it's only loosely secured with tape.
Also, I nearly didn't think to include the second copyright, and then when I did remember, I almost put LucasArts, but I thought that Lucasfilm Games would be a nice touch. Here's the label image. Click it for a larger version.
By the way, the cartridge is Space Invaders. I probably should've used my second copy of E.T. instead.