Just wanted to chime in as I saw your conversation.
Bike Rumor did a nice overview of our TURN brand cranks that will be using a 35mm Carbon spindle...
Have a read... http://www.bikerumor.com/?s=Praxis
The Praxis M35 BB system is just that. We wanted to design a BB system that worked in current OS standards and not create another standard...as we know how much of a headache that topic is. 35mm is a more manufacturing friendly size for using alternative materials (like carbon) for the spindle and push the stiffness needle up.
We're in deep dev on it now, with hopes to have the TURN carbon road crank out in by Interbike next year.
Hope that gives some insight..