first:
upload it with a .rar file
second: it fails because every model there is a button or avariable, and when u press it a thread runs. So if you try to modify it a little it will fail. Miserably
third: The models in the menu are probably the ones in the whole map. The rest is probably not models or just random objects/iw files and etc
fourth: i would do a new menu myself, but i think the way it is is fine and i dont wanna modify since i cant find a models list /