You will need to chop the subframe and make it fit.. Has been done a few times on zx6r.com and kawaiforums.The front might need some work and then you will need the lights as well.. can be done
to what end?
I'm not a fan of the 03' look. Much rather the 02'.
But then the 05 is a good looker
I don’t care how liberated this world becomes – a man will always be judged by the amount of alcohol he can consume – and a woman will be impressed, whether she likes it or not.
Doug Coughlin (Cocktail)
It's Easier if you get the whole rear of the 03.. Subframe and whole tail. Once you get the 03 subframe and put it on you will see how much it needs to be cut and welded to fit..
Have a look hear http://zx6r.com/zx6r/6599-project-mongrel-zx6r.html