Adjustable, none for the CB1100 but they do make a "universal" for do it yourselfers.
http://www.madstad.com/s.nl/sc.7/.f
The one they make for the Moto Guzzi Quota was the bee's knee's and other bikes found his solution to be very good.
I have one on my Tiger 800 and it transformed it. Universally loved. Not the prettiest, but superbly engineered.
I was going to put one on the Quota, but sold the bike before I pulled the trigger.
I had MadStad bracket on my Vee, and it was very useful. It could be adjusted across a wide range of heights and angles, so it made it easy to "tune" the screen to your height etc.
But...I don't see how you'd mount one on a CB. They're designed to bolt down where the stock screen mounts, and of course we don't have one.ou'd have to find a screen, or modify a screen, that would fit where the brackets wound up. The one possibility I see would be drilling the headlight brackets and putting the bracket on those. But...then you'd have to find a screen that fit the resulting bracket size/orientation. Do-able, but definitely not easy.
They offer up models that don't have windscreens like the Honda 230L so I put in an email to them regarding my 650L. That set up may work for the CB1100. Although a bikini fairing would look better.
Or a Vetter......
A Vetter would be very cool. And it would fit the design ethos of the CB nicely. I bet someone somewhere has the molds from at least a few of the Vetter models. I dont know if it would be legal, but a plug could be pulled from an existing fairing and then turned into a mold.
Interesting question. Craig Vetter sold the company; eventually it went away. I wonder if the rights have lapsed or what.