Get a BB designed for an E-Type derailuer
OR get a Truvative Gigapipe BB.
I have the Team DH (top of the line), and there is a spacer that you keep in if you aren't using a BB mounted guide, or you take it out if you are using a BB mounted guide.
hmm, my buddy has a first gen P3 and his had vertical dropouts and ISCG tabs... weird.