well tell me if you find anything that bothers you mate i guess you will understand code out there its quite simple i guess anyway check it out here:
Forbiden Spell Pack v2.5 [v1.1] version 1.0 GUI
EDIT: oh and btw if you want to take this little vGUI example to make any spell MUI and your spell pack you are free to do it just download the map 'vGUI Forbiden Spell Pack' and continue to make whatever you want i will delete my and you can upload yours so you will have your old spell pack in GUI and new one in vGUI if you want!
Anyway notify me when you want my (yours spell pack) map deleted.
I hope i helped you out enough
Greets!