That looks great shenske, but its not exactly all I was hoping for. See for me, I'm not really a fan of the custom spines being spead out to create a master image thing. I want the two games to be uniform yes, but I don't know if I care for the Pikachu and the other Pokémon crossing. Nothing against Pikachu, but he isn't the main focus of either title. I like the main idea you have there, and I defenetly think Kanto is a good choice for a background image across both, but I think you should get rid of all the current Pokémon there and crop in a Mewtwo on Stadium 1 and Ho-oh and Lugia on Stadium 2. The Pokémon should be cropped on each cover, not overlaping each cover. The background alone doing that is more than enough.
I'm also not particularly fond of adding "1" onto the first games of series. I'm of the opinion that if there is no bumber you assume its the first. One final comment: if you can, I'd like it if you could add in something to indicate it uses the transfer pak on the spine. Take a look at my Pocket Monsters Stadium spines for a general idea.
Again, not saying your work sucks in fact I think its fantastic. I just don't personally care for what's currently avalible. Thanks shenske.