A friend told me a few days ago he was thinking to modify a bit his Ducati SS900.
So I did a quick search on Internet and see below what I found. WOW...
They are not exactly the same 900SS than my friend has, but they are very good sources of inspiration.
What are you waiting Franco? ^_^
1993 Ducati 900ss High Pipe by Union Motorcycle
1993 Ducati 900ss Low Pipe by Union Motorcycle
900 TT (2011) by Radical Ducati