For those wanting to fabricate their own infills for the front frame triangles, I've taken some photos and measurements of the infills from the XJ600N that 1Oldman sent me. I'm certain 1Oldman already posted this info though for the life of me, I can't find it.
I'd recommend making these out of 1/8" ABS plastic and using heat to form them.
I'd then use a rubber/steel cable tie to secure them to the frame.
Measurements & geometry for the left infill (the right one is a mirror image):
