He's just asking for local modding to see skins locally.
It's in the RADS/projects/lol_game_client/ (or lol_game_client_en_us) I believe, but I'm not sure how to switch them around. It looks as if they use the different version numbers to store the different champions so you'd have to look around.
From the sizes, I'd guess they're hidden somewhere in lol_game_client. But you're right, a lot of the files I checked were empty.
Edit: It seems most of the data has been archived (or at least there are some large archive files here. who knows what they contain.) If you find something that can read this VCD file format and extract files from that, you may be able to find what you need.
Does this work: http://forum.leaguecraft.com/index.p..._fromsearch__1