Sega Genesis/Megadrive Mini Clamshells

I'm not sure if you guys are familiar with Sunsoft's mini clamshells they released for their Megadrive games in Japan. They span 5 x 3.5 x 1 (L, W, H). These things are adorable. My only complaint is that the loop on the manual side makes the booklets very hard to get back in once taken out, as they can get torn. Still, maybe a slightly modified mass-produced version would be nice. We may not be able to have booklets for them in those sizes, but we could definitely shrink the box arts available online and put them into the reproductions of the mini clamshells. I myself would love a mini clamshell for my copy of Sonic Classics on Genesis. We can offer US, PAL and Asian artworks inside them. I think it would be really charming to have them on the shelf for those of us who don't mind just having cartridges with a novel box!