I am not quite envisioning your fairing...like the zz thriller? got a sketch..?
I don't remember any significant speed increase.
the zzipper was ok.. small and light.. (I borrowed it from a friend of mine)
I don't see them selling it on zzipper.com
the new ones look bigger...(OS ZZ)
http://www.zzipper.com/Products/prod_upright.php
the original one
http://www.bikecult.com/works/collections/vdsRW.html
the second one I mentioned (not by zzipper) feels too big and heavy when attached to the handle bar.
I made a pvc mount to attach to the head tube.
too weak and bouncy... (annoy sound from fairing also)
didn't want to pay someone to make an aluminum mount.
gave up on it...
some other ones..
http://thenewcaferacersociety.blogspot.com/2008/12/welcome-to-future_09.html
http://www.mueller-hp.com/ub.htm
http://4.bp.blogspot.com/_LWGcbKlwPjU/TC9EoHK-YsI/AAAAAAAAATY/m19YKJC-tAA/s1600/R1-+7A.jpg
http://members.localnet.com/~milliken/liner/liners.htm
http://www.dhbc.org.au/forum/viewtopic.php?t=372