Any ranged hero will pick your turrets apart if left alone. I find that early game missiles are a huge help to keep them away.

While I agree with you on this build to an extent, I found that Ashe was an nuisance to me when. Any tips?

This build works well, and all i stack is Soulstealer first, then nothing but Zhonya's ring. Not only do you reach 800+ ability power, but you can place your turrets together and run off to another lane and help others while in the first lane your turrets kill champions on their own HAHA! so much fun!!