Well, the read me thread mentioned that I should include images, so I did. I have no clue how to spoiler them so they won't clutter anything, if that even is a possibility. Maybe make your read me thread clearer? I honestly have no clue what the actual rules are...
As for your post, thanks for the link for the cases, but they will be completely useless for Game Boy and Game Boy Colour games.
I'll try to repeat everything in hopes of making it clearer.
The covers posted on the site for PAL games are for PAL cases. The custom cases for Game Boy games are modelled after US cases. The PAL cases are bigger than the US cases, which means that PAL covers won't fit on US cases.
Other than that, the cover for PAL Link's Awakening and Link's Awakening DX is in German. Whilst the first one only has minor differences, the DX version is black instead of light brown, so completely different.
Since all my games are PAL, I'd like to keep all the retail covers PAL too, so nothing will stand out. Am I asking for too much?