Awesome collection! I love original ideas like this. 
And it might also be a good source for me when I make my lists of a specific Pokémon and am looking is a certain Pokémon is in other artworks.
Btw, are you only collecting one of each English artwork, or do you also plan on going after Japanese-exclusive artworks, or perhaps all different English variations (i.e. both 1st and unlimited edition; or both Reverse Holo and non-Holo)?
Actually, I see a few Japanese cards in there, so that partially answers my question. 
Greetz,
Quuador