TI-99/4A Standard Cartridge Shell

This is a cartridge shell sized for standard TI-99/4A cartridges. Minor adjustments made at the 2014 TI-99/4A Faire in Chicago. This is the last version that I authored of this shell.

If someone can please help me to convert this to metric, I’d be glad to re upload it as such.
I don’t have a license to Inventor any longer, so I cannot modify it.

I also changed the license; was brought to my attention that the default I had it under was restrictive. Knock yourself out and do whatever y