your evox.ini script should already be written so that games run from the E,F, and G directory. just make sure the folder inside those drives are named 'games'
from there, just copy your games through dvd2xbox to F:\games and it'll show up on your games menu.
i'm not that great at writing and editing scripts but you could try to find where the script directs to the xboxdash.xbe and redirect it to wherever your xboxdash.xbe is [the C: drive]