map file is resource/model/staticmodel/smash_battlefield.txt

on xml/uiimageset.xml, add copy the content of smash_minimap.txt and smash_loading into the xml data
also don't forget to properly match the config/sp2_mode_loading.ini for loading screen, and config/mode/.../...map.ini for the minimap and mesh file (into staticmodel/smash_battlefield.txt)