Here's the skinny on the P-One site as you see it today. This site is a snapshot of what will eventually be. Many of you wanted a glimpse of what Trek was planning with paint options so we put this site together to satisfy your curiosity.
Building a bike in P-One is a hands-on, consumer involved process. It is, after all, your custom bike that you are crafting. If you are serious about making a purchase, then you need to click your way to the print and find your dealer page. Take your printout to your Trek dealer for proper sizing options (this is where you will determine bar width, stem and crank length, etc).
I take responsibility for providing the wrong information about 5 series bikes being offered in the new P-One program. They are NOT available just yet. My apologies if you got you hopes up.