in your cstrike folder there is other folder named media, in there you'll find a file called gamestartup that's the audio file that you can listen in the startup, to change it you just need to delete the gamestartup audio file, and put in the same folder the music you want, then just rename the file to gamestartup. ( it must be a .mp3 file)
that gui is legal in official matches? like esl, lan, etc...
btw that configs are correct? axoN and coachi played small and in their configs it's autosize