Here are some early photos of the completed support structure. I use some very particular Dzus quarter turn quick release fasteners to attach the fairing to the structure, and added padded tape to reduce wear. And gave it some coats of flat black paint.
The design is more complicated than I'd like and I'd recommend an arrangement with one upper bar running the circumference and use lower bars on the sides to form a triangle just before the nose curves.
The crash bars are very sturdy as long as the frame bolts are well chosen and installed, but another support direction would help. The dustbin width is 21-22" vs the bars outer width of 28", which is why my mount cuts them short and makes them join in a different way.
The DBL1 (by contrast) can be supported by an aluminum bar running along the same plane as the crash bars themselves, holding up the nose along the top ridge, but requiring more effort creating and maintaining cutouts.
I think the Vetter nosecone could be supported by this latter method.