Summary

Remixed from Oeli's design here: https://www.thingiverse.com/thing:2792743

Their design mostly fit, except the rounded lip was too thick and needed to be extended a little out.

Note that this was the case for a first edition GameCube (the one that brought the digital ports). I believe that they have the same cover dimensions as the more widely available GameCube, but wanted to throw that out there.