Video is a bit shady, so switch to 720p HD quality for a best view.
The belly pan originally came from Seca II (US "600" model), but also fits japanese "400". It was from a crashed bike and torn to pieces. Repairing took some time: welding the plastics, a lot of "sculpting," some redesigning to accomodate rear brake pedal was needed. The mounting brackets were made DIY, too.
The bike is Yamaha XJ 400 S (4BP) from 1991 with my personal "touch."