One more thing-

Lightweight bikes are so fun. You'll love yours, and 13# is very doable with an aluminum frame, as long as the frame weight isn't much over 1500g. You don't need to go "plastic" to get 'em light. The one I'm riding now is a shade over 15# (steel), and that's a pound lighter than a buddies Super Six. Most of what I do though is 18-19# as most folks just can't do lightweight.

I build my own frames (steel) and just spec'ed a bike that will come in at 12.77#. That's based on observed weights, and a steel fork. I'm starting the frame now. The problem is the bucks. It's damn near 4 grand ready to ride, so this will be a bit getting up and running. Good luck with yours.