That build sucks, why have improved fireball and improved frostbolt?
It's clearly for pvp but you skipped imp CoC.
Winters chill not great for pvp.
Those are just a couple of things, but really the overall setup is pointless, where does the damage come from?
Surely in an elemental build you use frostbolt as main nuke, then pyro only for shatter crits.
Then, seeing as frostbolt is your main nuke, improved fireball is pointless so you should go for impact and a scorch+fireblast setup in the fire tree.
I would also think you would stretch to blastwave for the awesome shatter+blastwave combo, not to mention it's a great spell in its own right.
This would be my idea for an elemental build:
http://www.wowhead.com/?talent=RZVgRzbM0oZVAGIofxs0o