Hey Lee, welcome! I'm also new to the forum, getting a YBR125 next weekend so I can also work towards my full license.
One thing to just be aware of - I believe licenses are changing in January 2013, meaning DAS minimum age increases to 24. So unfortunately you may well find yourself having to do a restricted full license if you're looking to do it at 21. Sorry if I'm wrong on that...
Anyway, I'm really liking your SR mock-up!