well just some tips :
Make the AVS with regions, so it will be there next to those winshade close buttons etc.. (for example look at LB1's Winique)
Next to the on off the volume?
Crossfade and those others need to be skinned
ask that guy if he can do them too
The vis buttons toggles from AVS to VIS? good luck with that...
Next to the song info a posbar and the volume? Can you make it only posbar
And skin the song info + Posbar too....
good luck! it looks quite cool already