Yes, I can back it up. It will take a new sub frame, airbox, and seat to take full plastics. You can do some mods but I think they are substantial. The rear subframes are radically different from 07 onward. I think the rough estimate to upgrade the back half is between $400 and $ 700 depending on used vs. new.
With that said, you can upgrade all the way to 06 fairly easy (I think)