I can't replicate the same palette as the original, so I added all the images cropped so that anyone who wants to can edit them
Really great, nice job! I just did one really minor tweak to replace the dark title on the English cartridge with the lighter version of the title - so we have the dark background, but bright title, like in the Japanese cartridge:
Didn't really do anything, just combined the pieces you already created, but feel free to use it if you agree it's better. Here's the same revised cartridge, but alone and in the same canvas size/transparency/format Aaron provided it: http://i.imgur.com/HGxiW3J.png