How to apply textures to Character Trophies and view them in-game?

[playermode]

I've been asking this question for a while and haven't really gotten an answer. I'd like to know how to place textures on the 3d Trophy Models and view them in the Vault/Diorama mode. I tried the BrawlBox method..finding the BRRES file, opening it and opening the textures for it, replacing the textures with the custom textures, saving, and placing the new file into the corrent paths on my SD card, but it still doesn't work. Im not certain if im doing something wrong or not, so could someone just tell me their method or go in detail what I should be doing in BrawlBox to get this to work