I remember this one. If I remember correctly, it's an art-deco custombike based on a Henderson four-cylinder. When I Google it, I only find pictures of this particular bike (and of course lots of adorable naked fours), so I suspect it was a one-off.
So with the proper amount of petty-cash, I'm sure you could talk an adventurous panel-beater into fitting this sort of bodywork around a motorbike (doesn't have to be a Henderson, you can't see much of it anyway).