This is something I really want to do myself, but haven't been that successful in finding any real world examples...
I've seen an early model RSV with the late model race fairing/seat unit and it works well, but not seen anything else.
I'd like a nice, tight, pointy bum and have looked at the Tyga VFR400 tail (jap4performance), various SV650 conversions on twin shack and R6's circa 2004 model.
My problem is that I take my girlfriend on the back to actually need it to be functional, so haven't taken the plunge yet.
I'd love to graft a Ducati 1098 fairing on the front, a 2006-7 R6 tail unit on the back, an oversized front mudguard and a tiny exhaust.
Pipe dreams so far though!