I looked into this a couple years ago and still want to do something like the old R90s I once had.
The main thing s which slowed my interest are that the headlight is set way too far back into the forks for this to fit. Since I have figured I could 3d print spacers to push it out say an inch or two.
The other problem is aerodynamics.the R90s got a speed wobble which threw me off at over 100 mph. Open road and i managed to roll to a stop with minimal personal damage but bike was gone.
Talking to knowledgeable folks, they said this wAs common if the steering damper was old and not functioning. So if you do it, I recommend a good damper.
I will probably do something similar one day, love the look and desire more protection than a Dart screen.