A N64 Controller Pak housing for use with Element18592's 256kB N64-FRAM-Memory-Pak PCBA (https://github.com/Element18592/N64-FRAM-Memory-Pak).
The outer profile was simplified from the original N64 housing to improve print quality (i.e. less support required).

Use a couple M3x0.5 X 5-6mm pan head screws to secure the housing/cover together.

It won't work with the normal N64 PCBA since there is no relief for the battery on the bottom side, but it could be easily carved out to make it fit.