The students at the University of California at Davis scratch-built their salplane-esque 'Shamu'.They claimed Cd 0.15.
James Bede's Litestar motorcycle-based rig is Cd 0.18 'clean.'
Alex Tremulis was thinking Cd 0.11 for his X200
His X100 was Cd 0.20
Cambridge University really went after the body/wheel integration with the CUER and came in at Cd 0.10.