I converted a P2C into an aero road bike, I think the geometry is the same as the old P3C:

https://www.flickr.com/...933@N05/17470773863/

I use it for crits and for "road bike TTs". It is definitely not comfortable but fast as hell! I do not use it for road races longer than 3 hours. I have no problems to go fast through tight turns in crits.
I have long legs and long arms but a short body, with the 140mm stem and the low stack long reach of the P2 I can come close to my position at my dedicated Ridley Dean TT bike.